At the first stage of learning mental arithmetic, you need to teach your child to count up to 10. The skills of addition and subtraction up to 10 will help prepare preschoolers for school. Skill quick addition and subtraction can be developed only by decision the many examples. This activities teaches addition and subtraction of numbers up to 10 and has 6 levels of difficulty - from easy to difficult. Each of them includes twenty different examples. The higher the level, the more difficult it is. The panel will show the number of correct and incorrect answers.