Mathbrain

How long it takes for you to perform 30 calculations?Calculations involving only Addition, subtraction, multiplication or division operations with rising difficulty as the challenge progress.It could be a little demanding to top the list, but you can do it. Challenge yourself! 更新內(nèi)容： 穩(wěn)定性改進(jìn)和錯(cuò)誤修正。