Arf League

Who is Cahit Arf? What is Arf League?

Cahit Arf (11 October 1910 – 26 December 1997) was a Turkish mathematician. He is known for the Arf invariant of a quadratic form in characteristic 2 (applied in knot theory and surgery theory) in topology, the Hasse–Arf theorem in ramification theory, Arf semigroups, and Arf rings. For more information please check Wikipedia.
Arf League is for enthusiasts who seeks challenging math problems. Please feel free to send your solutions or general comments to challenging-problems@ahmath.com.
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✔ There are 132 problems and 82 key facts, waiting for math enthusiasts!

Dear Math Enthusiasts,
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A new problem will be released soon.

☆★☆★☆★ Newest Problem! ★☆★☆★☆

132. Problem: A64C , proposed by Ahmet Arduc

132 is the smallest number which is the sum of all of the 2-digit numbers that can be formed with its digits. Challenging Math Problem: A64C

Correct answers have been submitted by:

1. Caed Mark Medul Mendoza
2. Christian Paul C. Patawaran
3. Angelo M. Velasquez
4. Lee Csek
5. Lourenz Miguel Paras
6. Sumet Ketsri

Format of the items of the selection menu: Problem Order, Problem Code (Difficulty Level). Red problems have a difficulty level of less than 0.75, thus, as an example, a 0.18 means only 18% of all answers submitted are correct.

Number of Responses: 5835
Number of Correct R.: 4033
Difficulty Level: 69.12

1. Problem: 595A , proposed by Ahmet Arduc, Tip: Key Fact(s): 7695
1 is the multiplicative identity.

Correct answers have been submitted by:

1. Mohamed Karamany

2. Jeffrey Robles

3. Joseph Rodelas

4. Mahmut Cemrek

5. Suleyman Akarsu

6. Yavuz Selim Koseoglu

7. John Gamal Aziz Attia

8. Serkan Callioglu

9. Βαρελάς Γεώρ𝛾ιος

10. Marvin Cato

11. Isaiah James de Dios Maling

12. Joselito Torculas

13. John Albert A. Reyes

14. Nheil Ignacio

15. Gerald M. Pascua

16. Angelu G. Leynes

17. Roenz Joshlee Timbol

18. Rindell Mabunga

19. Caed Mark Medul Mendoza

20. Russel J. Galanido

21. Melga Sonio

22. Mark Elis Espiridion

23. Adrian Pilotos Burgos

24. Sumet Ketsri

25. Daniel James Molina

26. Nixon Balandra

27. Jacob Sabido

28. Poetri Sonya Tarabunga

29. John Patrick

30. Lilanie Monique Torilla

31. Chris Norman Algo

32. Christian Daang

33. Grant Lewis Bulaong

34. Richard Phillip Dimaala Fernandez

35. Jake Gacuan

36. Ibrahim Demir

37. Christian Paul C. Patawaran

38. Amirul Faiz Abdul Muthalib

39. Norwyn Nicholson Kah

40. Jhepoy Dizon

41. Ralph Macarasig

42. Dan Lang

43. Chayapol

44. Dreimuru Tempest

45. Kurara Chibana

46. Lim Jing Ren

47. Alea Astrea

48. Kumar Ayush

49. Joem Canciller

50. Gluttony

51. Serdal Aslantas

52. Radu Bogo

53. Barry Villanueva

54. Randy Orton

55. Captain Magneto

56. Willie Revillame Wowowin

57. Mertkan Simsek

58. Mark Lawrence P Velasco

59. Srinivas Kanigiri

60. Prince Ivan Paraiso

61. Dale Angelo Azas Cortez

62. Mythreya Lakshman

63. Bikram Chohan

64. Law Tik Shun

65. Gideon Tomas

66. Jereco Dela Pena

67. John Aries Sarza

68. John Kenneth Vito Cruz

69. echo gabata

70. Anjelo V. Racho

71. Darwin Ojera

72. Andrei Alido

73. Sam Kashkooli

74. Mark Kenneth Dairo

75. Adisa Tolani

76. Hanelet Santos

77. Reygan Medina Dionisio

78. Angelo Velasquez

79. Marvin Cato

80. Jade N. Mijares

81. Kot Behemot

82. Lee Csek

83. Charles Dwight M. Pelaez

84. Fujiwara Toneri

85. Arcy Leann

86. Daryll Ko

87. Mark David Mortel Dela Cruz

88. Maureen Jordan

89. Zhuo Qun Song

90. Rik Smoody

91. Max Wong

92. Hanz U. Baga

93. Angelo M. Velasquez

94. angelo magdaong

95. Vaibhav Priyadarshi

96. Romeo Dane D. Melendrez

97. Bryant Ularte

98. Lisa Sauermann

99. Sajib Kumar Chowdhury

100. Raffy Salazar

101. Christian Rozano

102. Lourenz Miguel Paras

103. Ric Tura Jr

104. charles edward

105. Angelo Bungcaras Magdaong

106. Ramon Villota

107. Ian Galang

108. Joem Canciller

109. Hanlee Wong

Futured Math Enthusiasts

The first problem
is solved firstly by
Mohamed Karamany

Last solved problem
2D73
by Hanlee Wong

Coming Soon
Long Jumper

Coming Soon
Marathon Runner

Number of page views
since 11.11.2019
77693

Score Table - Math Enthusiasts (only the first 100)

Score depends on number of correct answers and number of trials.

FS stands for First Solver. For each problem, there is a first solver. Each time you solve a problem as the first person your FS score increases by one.
SF stands for Solution Files. Some of the Math Enthusiasts sends solutions to the problems. This is to promote their valuable contribution to the Arf League.
SP stands for Sniper. You can get this badge if and only if you do not miss any problem in your first try and solve them correctly. Only snipers have the potential to get the full score.
UT stands for User Type. "MT" is for Math Teacher and "S" is for Student.

hide this Please submit your country to be listed in this table!

Joem Canciller
charles edward
Jay Lee
Romeo Dane D. Melendrez

Order	Score	# of Correct Answers	Names	Badges				Country
Order	Score	# of Correct Answers	Names	FS	SF	SP	UT	Country
1.	097.73	130	Angelo M. Velasquez	130	47		S	Philippines
2.	083.69	127	Lee Csek	127	2			China
3.	083.63	117	Lisa Sauermann	117	2		S	Germany
4.	083.05	123	Zhuo Qun Song	123	2		S	Canada
5.	076.71	122	Daryll Ko	122	0		S	Philippines
6.	076.48	115	Isaiah James de Dios Maling	115	34		MT	Philippines
7.	075.22	128	Caed Mark Medul Mendoza	128	112		MT	Philippines
8.	060.31	94	Jeffrey Robles	94	5			Philippines
9.	056.20	103	Reygan Medina Dionisio	103	2		MT	Philippines
10.	052.13	92	Richard Phillip Dimaala Fernandez	92	90		MT	Philippines
11.	050.76	67	Lilanie Monique Torilla	67	55	❂	S	Philippines
12.	049.96	84	Jereco Dela Pena	84	0		MT	Philippines
13.	047.77	65	Sumet Ketsri	65	67			Thailand
14.	045.46	71	Amirul Faiz Abdul Muthalib	71	0		MT	Malaysia
15.	042.43	69	Radu Bogo	69	45			Romania
16.	041.02	62	Kurara Chibana	62	0		S	Japan
17.	040.91	54	Willie Revillame Wowowin	54	0	❂		Philippines
18.	040.63	63	Russel J. Galanido	63	30		S	South Korea
19.	035.87	66	Mertkan Simsek	66	0		MT	Turkey
20.	035.82	79	Christian Paul C. Patawaran	79	1		S	Philippines
21.	035.06	54	Marvin Cato	51	30		MT	Philippines
22.	031.73	66	Fujiwara Toneri	66	6		S	Japan
23.	031.31	62	Arcy Leann	62	15		S	Philippines
24.	030.57	52	Law Tik Shun	52	0		MT	Hong Kong
25.	029.56	40	Hanlee Wong	40	41		S	Singapore
26.	028.61	48	Nixon Balandra	48	46		MT	Philippines
27.	028.32	54	Randy Orton	54	0			United States of America
28.	028.12	60	Rindell Mabunga	60	31		S	Philippines
29.	027.15	49	Raffy Salazar	49	0		S	Philippines
30.	026.52	35	Arjun Singh Rajawat	35	4	❂	S	India
31.	025.57	45	Rik Smoody	45	0		MT	United States of America
32.	025.47	41	Jacob Sabido	41	5		S	Philippines
33.	022.74	41	Darwin Ojera	41	22		MT	Philippines
34.	020.88	41	Joselito Torculas	41	26			Philippines
35.	020.18	57	Roenz Joshlee Timbol	57	1		S	Philippines
36.	020.04	36	Lim Jing Ren	36	0		S	Malaysia
37.	019.70	26	Alea Astrea	26	0	❂	S	Philippines
38.	019.48	30	echo gabata	30	0			Vietnam
39.	019.25	36	Lourenz Miguel Paras	36	0		S	Philippines
40.	017.44	41	Hanz U. Baga	41	73		S	Philippines
41.	017.07	26	Kuba Helsztynski	26	0		MT	Poland
42.	015.06	26	Sajib Kumar Chowdhury	26	0		S	Bangladesh
43.	014.39	19	Lenard Guillermo	19	2	❂	S	Philippines
44.	013.77	20	Gluttony	20	0			Philippines
45.	013.64	30	Angelo Bungcaras Magdaong	30	1		MT	Philippines
46.	013.27	29	Joseph Rodelas	29	0		S	Philippines
47.	012.63	20	Mark Alvero	20	0		MT	Philippines
48.	012.49	26	Norwyn Nicholson Kah	26	38		S	Philippines
49.	012.46	25	Jhepoy Dizon	25	0		S	Philippines
50.	012.43	19	Ramon Villota	19	0		S	Philippines
51.	011.75	32	Daniel James Molina	32	1		S	Philippines
52.	011.22	20	Ralph Macarasig	20	0		S	Philippines
53.	011.16	18	Ric Tura Jr	18	21		S	Philippines
54.	010.67	18	Maureen Jordan	18	1			Singapore
55.	010.61	14	John Albert A. Reyes	14	6	❂	S	Philippines
56.	009.95	17	Nheil Ignacio	17	8		S	Philippines
57.	009.65	22	Hanelet Santos	22	15		S	Philippines
58.	009.54	23	Kumar Ayush	23	1		S	India
59.	009.14	28	Mark Kenneth Dairo	28	26		S	Philippines
60.	009.12	17	Ibrahim Demir	17	1		MT	Turkey
61.	008.77	18	Francis Gerard Magtibay	18	0		S	Philippines
62.	008.66	20	Charles Dwight M. Pelaez	20	8		S	Philippines
63.	008.55	19	Bikram Chohan	19	5		S	India
64.	008.33	11	Melga Sonio	11	0	❂	S	Philippines
65.	008.29	19	angelo magdaong	19	0		MT	Philippines
66.	008.00	13	Poetri Sonya Tarabunga	13	0		S	Indonesia
67.	007.42	14	Ewen Goisot	14	17			France
68.	007.05	11	Max Wong	11	0		S	Hong Kong
69.	007.00	43	Kimi No Nawa	43	166		S	Japan
70.	006.96	21	Christian Daang	21	25		S	Philippines
71.	006.75	14	Angelu G. Leynes	14	0		S	Philippines
72.	006.55	11	Mark Elis Espiridion	11	0			Philippines
73.	006.26	17	Stefano Ongari	17	0		S	Italy
74.	005.82	13	Chris Norman Algo	13	10		S	Philippines
75.	005.30	7	Adrian Pilotos Burgos	7	0	❂		Philippines
76.	004.55	6	Yavuz Selim Koseoglu	6	0	❂	S	Turkey
77.	004.55	6	Mahmut Cemrek	6	0	❂		Turkey
78.	004.55	6	John Gamal Aziz Attia	6	1	❂	S	Egypt
79.	004.55	6	Jade N. Mijares	6	0	❂	S	Philippines
80.	003.66	13	Aljun Emperado	13	3		S	Philippines
81.	003.25	27	Keedgwh	27	0			India
82.	003.03	6	Liu Chen	6	0			China
83.	003.03	6	Kevin Durant	6	0		S	Turkey
84.	003.03	6	John Lester Tan	6	0		S	Philippines
85.	003.03	4	Vaibhav Priyadarshi	4	0	❂	S	India
86.	003.03	4	Βαρελάς Γεώρ𝛾ιος	4	0	❂		Greece
87.	002.71	5	Kot Behemot	5	0		MT	United States of America
88.	002.42	4	Saket Singh Rajawat	4	1		S	India
89.	002.42	4	Bryant Ularte	4	0		MT	Philippines
90.	002.27	3	Jomari Mama	3	0	❂	MT	Philippines
91.	002.27	3	Gerald M. Pascua	3	0	❂		Philippines
92.	001.89	5	Leandro Dar Juan	5	0		S	Philippines
93.	001.89	5	Ian Galang	5	0		S	Philippines
94.	001.73	4	Smahi Abdeslem	4	4		S	Algeria
95.	001.73	4	Elijah Evangelista	4	0		S	Palau
96.	001.52	6	David Paul	6	0		S	Philippines
97.	001.52	4	Luke Robitaille	3	1		S	United States of America
98.	001.52	2	James Harden	2	0	❂	S	Philippines
99.	001.36	3	John Kenneth Vito Cruz	3	0		S	Philippines
100.	001.10	4	Mark David Mortel Dela Cruz	4	0		S	Philippines

hide this All problems are solved 3680 times.

Score Table - Countries

NOTE: Countries are listed according to their first answer submit dates.

Country	# of Correct Answers	# of Trials	Performance
Egypt	7	7	100%
Philippines	2459	3540	69.46%
Turkey	111	156	71.15%
Greece	4	4	100%
South Korea	63	74	85.14%
Thailand	87	107	81.31%
Indonesia	13	16	81.25%
Japan	184	396	46.46%
Malaysia	107	133	80.45%
Peru	1	1	100%
Algeria	4	7	57.14%
India	151	340	44.41%
Canada	127	145	87.59%
Italy	17	35	48.57%
Romania	71	90	78.89%
United States of America	117	167	70.06%
Germany	118	125	94.4%
France	14	20	70%
Poland	26	30	86.67%
Hong Kong	64	82	78.05%
Vietnam	30	35	85.71%
Iran	2	8	25%
Nigeria	1	1	100%
China	133	155	85.81%
Singapore	58	64	90.63%
Bangladesh	26	34	76.47%
Palau	4	7	57.14%
Argentina	0	2	0%

Worked Solutions to the Problems

Solutions to all Challenging Math Problems are ready!
$Solutions for the first 10 Challenging Math Problems$

If you want to get the pdf of all the questions with solutions please do the payment by using the paypal button given on the left.

For more documents and info about olympiads, please click Olympiads.

Online Problem Solver

Key Facts

1. Key Fact 7446 |Tags: product, rational, number, irrational
2. Key Fact 7695 |Tags: fraction, lowest term, numerator, denominator, relatively prime
3. Key Fact ABAD |Tags: square, even, integer, divisibility
4. Key Fact BAB3 |Tags: square, odd, integer, divisibility
5. Key Fact 988C |Tags: product, perfect square, consecutive numbers
6. Key Fact 9A34 |Tags: divisibility
7. Key Fact B664 |Tags: identity, factorial
8. Key Fact 969B |Tags: identity
9. Key Fact CE81 |Tags: identity
10. Key Fact B945 |Tags: identity
11. Key Fact BCC8 |Tags: factorial, inequality
12. Key Fact 965A |Tags: identity
13. Key Fact E856 |Tags: identity
14. Key Fact 7C45 |Tags: Sophie-Germain, identity
15. Key Fact EA1C |Tags: identity
16. Key Fact 3E17 |Tags: identity, factorization
17. Key Fact 2545 |Tags: identity, factorization
18. Key Fact A376 |Tags: identity
19. Key Fact 3278 |Tags: composite number
20. Key Fact 2DCC |Tags: prime number, definition
21. Key Fact 87D4 |Tags: prime number, composite number, 1
22. Key Fact 9E11 |Tags: prime number, composite number, 1
23. Key Fact A478 |Tags: prime number, even
24. Key Fact 2AB2 |Tags: prime number
25. Key Fact DAEA |Tags: prime numbers
26. Key Fact 9ECE |Tags: prime factorization
27. Key Fact 525C |Tags: prime number, composite number
28. Key Fact 163E |Tags: Wilson&#39;s Theorem
29. Key Fact 5221 |Tags: Bertrand&#39;s Postulate, prime number
30. Key Fact 24D6 |Tags: Bonse&#39;s Inequality, prime numbers
31. Key Fact C181 |Tags: prime, divisor
32. Key Fact 8A33 |Tags: divisibility, square, odd, integer
33. Key Fact 7B55 |Tags: divisibility
34. Key Fact 8C41 |Tags: divisibility
35. Key Fact 8632 |Tags: product, consecutive, integer, divisibility
36. Key Fact EADA |Tags: divisibility
37. Key Fact A4A7 |Tags: binomial expansion
38. Key Fact 3845 |Tags: binomial expansion, number of terms
39. Key Fact D8CD |Tags: identity
40. Key Fact DEA5 |Tags: identity
41. Key Fact 7B38 |Tags: identity
42. Key Fact 2EBB |Tags: identity
43. Key Fact 89DD |Tags: identity
44. Key Fact ECD9 |Tags: chessboard, square
45. Key Fact A86B |Tags: arithmetic mean, real numbers
46. Key Fact B65C |Tags: geometric mean, real numbers
47. Key Fact D477 |Tags: arithmetic mean, geometric mean, inequality
48. Key Fact DDC5 |Tags: harmonic mean, real numbers
49. Key Fact 29D9 |Tags: arithmetic mean, harmonic mean, inequality
50. Key Fact 5375 |Tags: inequality
51. Key Fact 1E7C |Tags: inequality
52. Key Fact 3981 |Tags: inequality
53. Key Fact 1EB9 |Tags: inequality, identity
54. Key Fact D7B8 |Tags: inequality
55. Key Fact 2483 |Tags: inequality
56. Key Fact 6C13 |Tags: inequality
57. Key Fact 7185 |Tags: inequality
58. Key Fact 8C62 |Tags: inequality
59. Key Fact 913D |Tags: inequality, identity
60. Key Fact ADBA |Tags: Cauchy–Schwarz, inequality
61. Key Fact 2169 |Tags: Chebyshev, inequality
62. Key Fact E1B9 |Tags: line, intersection, parabola, abscissa, vertex, midpoint, line segment
63. Key Fact 72A4 |Tags: De Moivre, formula
64. Key Fact 5DB3 |Tags: fibonacci, numbers
65. Key Fact 47EB |Tags: finite serie, finite sequence
66. Key Fact 13D3 |Tags: infinite serie, infinite sequence
67. Key Fact EAA4 |Tags: partial sum, series
68. Key Fact 3332 |Tags: sequence, partial sum, series, limit
69. Key Fact 2B69 |Tags: sequence, partial sum, series, limit
70. Key Fact C62B |Tags: series, sum
71. Key Fact 1529 |Tags: sum, infinite serie
72. Key Fact E6E7 |Tags: relative error, measurement
73. Key Fact 8B56 |Tags: angle, bisector, triangle
74. Key Fact B4C3 |Tags: sum, exterior angles, convex, polygon
75. Key Fact C4CC |Tags: triangle, circle, greatest area, isosceles triangle
76. Key Fact 8146 |Tags: circle, plane, common tangent
77. Key Fact B13A |Tags: lattice points, gcd, greatest common divisor
78. Key Fact 4BC8 |Tags: right triangle, median
79. Key Fact 2B31 |Tags: minimal polynomial
80. Key Fact C77E |Tags: british flag theorem, rectangle, geometry
81. Key Fact B9E9 |Tags: pythagorean triple, triangle
82. Key Fact 865E |Tags: primitive pythagorean triples, triangle

If you want to be a problem (or key fact) writer, please contact AhMath by sending an email to challenging-problems@ahmath.com.

Ahmet Arduc

Question Writer

Number of questions: 113

Ahmet worked as a maths olympiad instructor for many years. He is the editor and co-author of the unpublished 484-page book “Mathematical Olympiad Preliminary Question Bank, with 1001 solved questions”. His students got high achievements in many local and national mathematical competitions.

Amirul Faiz Abdul Muthalib

Problem Writer

Number of problems: 10

With over 5 years of hands-on, successful teaching experience, Amirul is an enthusiastic Pre-University Mathematics Lecturer in INTEC Education College, Malaysia. Being a versatile individual who love Maths, he has earned a Master’s Degree in Mechanical Engineering in Japan. He had opportunity to teach Maths in Japanese Syllabus for scholarship sponsored students who will further their study in KOSEN (National College of Technology in Japan). He also train some of his students for the National Olympiad every year.

İhsan Yücel

Problem Writer

Number of problems: 3

Ihsan is currently in the thesis phase of his postgraduate education, which is about mathematics teaching education. He got some notable national and international achievements in various secondary school mathematics and project competitions. He’s an author of many scientific articles about mathematics in the quarterly magazine "Mathematical World". He’s the founder of Matematik Meraklısı, a website dedicated to Mathematics.

Richard Phillip Dimaala Fernandez

Problem Writer

Number of problems: 1

Richard is an experienced math teacher in a Chinese school in the Philippines. He is a product of Philippine Normal University (National Center for Teacher Excellence). He trains students who compete in both local and international math competitions. He is a trainer in Mathematics Trainers' Guild, Philippines (MTG Philippines) and Metrobank-MTAP-DepEd Math Challenge (MMC). He is also a lecturer in one of the review centers specialized in university entrance examinations. He is also a Suken Test Passer (Mathematics Certification Institute of Japan).

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It's a good way to practice maths and also the site encourages you to submit your answer with an accompanying solution. Participants can not just simply guess the answer or predict what will be the answer based on the given, they need to know and understand the topic. Also this refrains participants to just simply ask the answer from other people. So the method was excellent and people will definitely learn many things about math.

- Rindell Mabunga / Philippines

I want to say my deepest gratitude in creating this website. The questions are not the typical type and not normally taught to non-mathematical major degrees. I really hope that you'll continue your mission and vision in creating this site, as this serves as a platform to enhance our mathematical skills. Hoping for the best good luck!!!

- Russel J. Galanido / South Korea

I see AhMath as the one encouraging self-paced learning or practice in solving math problems. It does not put me into any kind of pressure like requiring myself to be the first one to solve the problems correctly and giving answers with a limited time. Also, it gives me excitement for the next problems to solve as well as for the appearance of my name on the list of the people who submitted the correct solutions and answers for those math problems. Overall, it gives me confidence to be better in math.
Thank you for everything, AhMath.

- Marvin Cato / Philippines

I knew AhMath from a facebook group, "Math Enthusiasts Quiz Group", that I just joined a few weeks ago. Then I found that there are the "challenging math problems" here that refresh my Math skill.
I like many ideas on this website, the word "Math Enthusiasts" exactly describes what I'm and it makes me recall the feeling about Math when I was young, it was fun and exciting!
I like the motto "Real than i, rational than n", it's playing in my head and I'm still doubt about its meaning :-D
There is no time constraint for solving the problems so we can think about the solutions in the different ways. Sometimes the new solutions reveal the beauty of Math and that only happens when we have time to think about other solutions.
Thank you the creator and moderator of this website, especially Ahmet Arduc, who brings me back to the feeling of fun and exciting with his creative problems.

- Sumet Ketsri / Thailand

Ahmath is basically a great site. The problems are really challenging and mind boggling. I really like the way that the Math enthusiasts should show the solution as well for each problem. You need to learn on your own. This site greatly help me improve my Math skills and writing solutions as well. Thank you much Ahmath for an amazing job. More power and God bless. "Train HARD, win EASY. Train Easy, win HARD". Hoping you all the best out there. Just continue on your aim to help the students as well as the non-students to further enhance their math skills. God bless and More power AHMATH FTW!!!

- Isaiah James de Dios Maling / Philippines

I want to thank sir Ahmet Arduc for creating this wonderful site AhMath. The "Challenging Math Problems" are really challenging. Most of the problems are math problems that you can't normally encounter in school. You can solve the problems in different ways. You can find some beautiful patterns while solving these problems. The problems are addictive especially the problems created by sir Ahmet. It brings me back the way i feel when i was young, the excitement and having fun when solving math problems. I'm always excited to see my name on the list of people who solved the problem correctly! I can say that I am really a Math Enthusiast now and I improved a lot with my mathematical skills. I also like that there is no time limit in solving the problems. You can solve the problems when you are not busy or you are in the mood to solve. Thank you Ahmath, I hope you'll continue to improve this site and help us to be better. Hoping you all the best, God bless!

- Caed Mark Medul Mendoza / Philippines

I am not one of the most gifted math wizards from my country. Through AhMath, I am able to hone my skills and at least par with them, although I am still far from their prowess. Some simple questions are masked to seem difficult and all problems that I have solved felt satisfying knowing that I was able to use, display, and hone my skills.

- Fujiwara Toneri / Japan

This is a good website for math enthusiast who wants to challenge their math ability. Thanks for questions that push us to think differently and of course to learn new things.. More powers and God Bless.

- Reygan Dionisio / Philippines