Quick Training-Calculation

Application description:
Quick calculation training-Quick calculation speed training to quickly improve your computing ability.
This application offers three calculation difficulties:
1. Within ten (one digit) addition and subtraction calculation;
2. Addition and subtraction calculation within one hundred (two digits);
3. Addition and subtraction calculation within one thousand (three digits);
Random questions, both positive and negative calculations are available.
Challenge it and see how many consecutive correct answers you can create!