Em lượm một số bài toán hay của TTH-Math-Olympiad để các mẹ và các con thử sức.


Q1. What is the last two digits of the number?


(10 + 11 + 12 + ... +2010)^2


Q7. How many integers from 1 to 2010 have the sum of their digits divisible by 5?


Q9. The figure below show a 10×10 square with small 2×2 squares removed from the corners. What is the area of the shaded region?


Q11. All the students in a APMOPS training class took a 100 point test. Five students scored 100, each student scored at least 60, and the mean score was 76. What is the smallest possible number of students in the class?