Idiom four operations is a combination of four mathematical operations idiom learning games education through fun way to learn about numbers and idioms, as well as four practice simple mathematical operations.

* 464 digital idioms currently included, there are more than 1800 kinds of arithmetic questions, more than 13 million kinds of combinations of the subject changes.
* Digital idiom review: always check and review.
* Four arithmetic exercise: Exercise four mathematical operations without pressure.
* Idiom four operations: arithmetic combination idiom game mode, make learning more fun.

Source code can be downloaded here: https://github.com/cnyaw/idiomcalc