1 1- 10、 18-8、 10+4、5+4+6

6+ 10、6+ 10、 13-3、7+2+3

16-6、 10+9、 14- 1、3+4+ 10

16- 10、8+ 10、 10+2、 1 1- 1-5

10+3、 13-3、 13-3、 17-7-3

3+ 10、5+ 10、3+ 15、 19-9+ 1

13-3、 16- 10、 18-8 、 15-5-7

Senior one addition and subtraction skills:

The division and combination of numbers within 1 and 10 laid a solid foundation for the addition and subtraction of elementary mathematics.

Because the addition and subtraction within 10 is the basis of addition and subtraction calculation in primary school mathematics, just like the multiplication formula in the second grade, let children remember the division and combination of 10 numbers. For example, 2 and 4 make up 6, and we can know that 2+4 = 6; If 3 and 5 make up 8, we can know that 3+5=8, and so on.

2. Learn to split numbers and make whole tens.

Add and subtract numbers greater than 10, and teach children to learn how to divide numbers and make up whole tens, which is the commonly used "make up ten method". For example, 16+3=? Divide 16 into 10 and 6,6+3 = 9, 10+9 = 19.