The second grade primary school mathematics mental arithmetic exercises of 5000 questions.
99 multiplication formulas.
99 division formulas.
Multiplication and addition and subtraction mixing.
Division and addition and subtraction mixing.
less than 1000 of the addition and subtraction.
1, Increase the × option buttons, record the wrong topic, to practice alone;
2, "grade" right arrow can be continuously the answer;
3, five questions to answer the right animation;
4, redesign the UI.