Basic counting techniques are formed in the child in the first years of study. That is why it is very important to pay special attention to developing this skill. The manual provides examples and tasks for addition and subtraction within 10 and within 20.Different types of exercises are given: for simple and separate addition and subtraction, combined examples, for addition and subtraction with the transition through a dozen. For help in solving, below the examples, brackets are offered for decomposing the addend and the subtrahend into components convenient for counting. Examples and tasks of the book will help the child work out and consolidate counting skills to automatism, activate mental activity, develop memory, attention and speed of reaction.The book was prepared in accordance with the requirements of the Federal State Educational Standard of Primary Education. It can be used when working with any textbook included in the Federal List. The manual will be useful in mathematics lessons and for self-study at home.