Math puzzles - Brain exercise

Pupils Math Puzzle
Contains 11 chapters, each containing 10 levels of difficulty, massive different topics, let you enjoy the challenge!
1-4: basic arithmetic, Math individual arithmetic
5: addition, subtraction mixed computing
6: exponentiation
7: According to the given four topics, the calculated result of the operation of a maximum or minimum
8: Percentage, calculated as a percentage of the value given learning
9: calculation gives the greatest common divisor or least common multiple of two numbers
10: 3-6 gives some numbers to find the median or average value is calculated
11: equation, practice simple arithmetic equation