When you add and together you get . does not equal because . does not equal because . does not equal because .

To add we count up. Start at and count up .

This is an example of commutative property. Commutative property of addition means that you can change the order of the smallest two numbers when adding, and it will always equal the biggest number.

To add we count up. Start at and count up .

To add we count up. Start at and count up .

To subtract we can count backwards. Start at and count back .

To find the missing piece of an addition problem, you can take the biggest number minus the smallest number. , which means .

To add we count up. Start at and count up .

To add we count up. Start at and count up .

Both and equal . So these two equations equal each other. , , and . Because none of these equations equal , they can’t be equal to .