Write it in the first half of Tian Zige, the corresponding Tian Zige under 2, the decomposition number, and the number under the decomposition number.

Every composite number can be written as the product of several prime numbers. Every prime number is a factor of this composite number, which is called the prime factor of this composite number.

Prime factorization only applies to composite numbers.

A composite number is expressed by multiplying several prime numbers, which is called prime factorization.

For example: 12=2x2x3.

18=2*3*3 。

25=5*5 。

28=2*2*7 。

49=7*7 。

9 1=7* 13 。

125=5*5*5。

According to the Guide to Learning and Development for Children Aged 3 ~ 6, children are required to master points within 10 when attending classes in large classes in kindergartens.

Many parents think that the division and combination of numbers are the same as addition and subtraction. As long as you learn to add and subtract, there is no need to divide.

But in fact, from the process of learning mathematical addition and subtraction, children can better understand the concept of mathematical addition and subtraction and discover the hidden laws in addition and subtraction by learning division and association law.