math
posted by desmiyoung .
how to do you do missing digits to make each number sentence true

2 + ___ = 10
What number sentence do you want help with? 
Use structure what property of addition is shown in the following number sentence ?explain7+(3+5)=(7+3)+5

The average of four numbers is 21. If three numbers are 12, 18, and 28, what is the missing number?

Arrange digits 126 and 8 to make the each snumber sentence true use each digits only once

Arrange digits 126 and 8 to make the each snumber sentence true use each digits only once