I have experience in this field. 1. It should be easier to understand to buy a card for addition and subtraction within 10. It is suggested that the preschool oral arithmetic problems should be taught early by Kajimei Publishing House, so that children can do addition problems within 10 every day on their way to school and when they take the bus, and let them do addition problems within 10 during the advertising time of watching TV (a little over ten o'clock). 2. Do subtraction within 10 after familiarity. The oral arithmetic problem card is 2 pages a day and is done for one month. 3, buy a 20-year-old, abdicated addition and subtraction card to do. 4, buy a 20-year-old entry, abdicate, add and subtract, and do it. Two pages a day. There are up to ten ways to teach children. Such as 7+8

Say 7' s best friend is 3, and 8 can be divided by 3 and 5, so 7+8=7+3+5= 15.

15-7

7 can be divided into 5 and 2.

therefore

15-7= 15-5-2=8

In this way, the child passed the exam in about two months. Skillful calculation of addition and subtraction within ten minutes will directly affect the later study, so practice more.