MathPractice for PrimarySchool

In modern society, parents are always busy in work or societal activities, may not put sufficient time in children's education and homework.
The App, named "Math Practice for Primary School", is designed to resolve this problem.
It can help parents and children to improve their mathematics via variant questions, including +, -, *, /, () or mixed of them.
1.It can set no. of questions per practice.
2.It can set max number used in questions.
3.It can set 2 numbers or 3 numbers or random of questions.
4.It also provides timing for the practice.
5.Can still correct wrong answer after submission.
6.Leaderboard for all users on Accuracy and Time Spent per Score
7.Local user history on Accuracy and Time Spent per Score