3000 examples in mathematics. We count and explain. Multiplication and division. 4th grade. Pisorova O. V.

The manual contains examples on the basic topic of mathematics for the 4th grade “Extra -table multiplication and division” that will help to work out to automatism all types of account techniques: multiplication and division of round numbers of the type 90: 3, 40x2, 240: 60; Extra -table multiplication and division by a definite number of species 18x6, 91: 7; division into a two -digit number of the species 48:12; Multiplication and division of round numbers of the type 300x400, 12000: 300, 5100: 170; The division with the remainder of the view 17: 4.

For each type of 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 pronouncing the algorithm when solving examples in the 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 he has to fulfill complex calculations.

manual can be used in school lessons and for independent classes at home.