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 (a little over ten o'clock) when watching TV. 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. Ten ways to teach children add up. For example, 7+8 means that 7' s best friend is 3, and 8 can be divided by 3 and 5, so 7+8 = 7+3+5 = 15-77 can be divided by 5 and 2, so 15-7= 15-5-2=8, so the child will be born in about two months. Skillful calculation of addition and subtraction within ten minutes will directly affect the later study, so practice more.