Unit 3-4 of the second semester of the second grade mathematics is tested and reviewed.

First, fill in and calculate.

1, oral calculation. (12)

9×5= 69-40 = 99-43= 100-63=

8+6 = 63÷9 = 56+23 = 9×7=

35÷6= 18+6 = 72÷8 = 75+25=

2. What can I fill in ()? (12)

( )×6