3000 examples in mathematics. We count and explain. Addition and subtraction. Grade 2

The manual contains examples of one of the basic topics of mathematics for the 2nd grade “Addition and subtraction within 100”, which will help to work out to automatism all types of account techniques: numbering calculations of the type 65+1, 65–1 and species 20+6, 26–26– 20, 26–6, addition and subtraction without transition through a category of type 36+3, 53–2, subtraction from a round number of a type 60–2, calculations with round and non -round numbers of the type 40+16, 40–16.
For each account of the account, algorithms are given, knowing which, the child will calculate correctly and quickly. It is very important to bring the skill of using the account algorithm to automatism. It is most effective for this to use the commented score.
First, the teacher explains how to consider - clearly pronounces and repeats the account algorithm. Then the children take turns saying an algorithm when solving examples in columns. The child should reason as it is written in the algorithm. For any difficulty, he needs to help, prompt. If the child learns to speak well, he will learn to quickly count, and this is the key to success in high school when you have to perform complex calculations.
Manual can be used in school lessons and for independent classes at home