Prime number's rule and a related AMC problem

Solve the square root equation related to 2025 (Bless your coming new year of 2025!)

Prime number's rule and a related AMC problem

Solve and explain an AMC12 Probability problem in easy thinking

让初中生就可以懂的AMC12概率题！（美国数学竞赛）

Evaluate the square of 699.5 (计算 699.5的平方)

Compare 999^1000 and 1000^999!

用逆向思维求解关于上升数的数学竞赛题 (Use reverse thinking to solve an AMC10 question about rising numbers)

质数要符合的规律及相关数学竞赛题

2 nets problems from ISEE Upper-level Math

A challenge problem from Singapore Math (6A for Grade 7 students)

What basic knowledges are needed before challenging AMC 10/12 math competition?

2022春节趣味题：通过余数求解未知数目（Chinese remainder theorem）