My Crazy Math app for iPhone and iPad

Your child will learn things like adding two numbers, changing the order of the numbers but not changing the results, or adding different numbers to the same result. They will eventually learn to use different number strategies, and add, subtract, multiply, and divide numbers to let you learn the operations of each number.
The main function:
-Addition, subtraction, multiplication and division in any number range (0 ~ 9999).
-Mixed operation of each grade designed by outline.
-Recommended question types based on historical records to enhance arithmetic skills.
-Draft calculus.

Letting children improve their mathematical ability in entertainment is a good helper for children to learn mathematics.