Exercises for addition and subtraction up to 10 are for children who starts studying math.
After you finish exercises up to 10, you can do the training up to 20 and 100. Tasks when something is missing help children to train their skills. Before working with more difficult tasks we recommend you to repeat with your child such topics like first summand, second summand, sum, minuend, subtrahend, difference.
Chains consist of several easy exercises. We recommend you to start chains after passing simple exercises. The most difficult in this block of tasks are exercises which consist of chains with brackets. You are recommended to do them after doing the other exercises.
When you finish this block of tasks, you can start doing tasks on multiplication and division, comparison and length.