addends can be regrouped and the sum remains the same

numbers can be added in any order and

the sum remains the same

states that the sum of any number and zero is that same number

two operations that undo each other

numbers that are easy to add, subtract,

multiply, or divide mentally

addends can be regrouped and the sum remains the same

numbers can be added in any order and

the sum remains the same

states that the sum of any number and zero is that same number

two operations that undo each other

numbers that are easy to add, subtract,

multiply, or divide mentally

addends can be regrouped and the sum remains the same

numbers can be added in any order and

the sum remains the same

states that the sum of any number and zero is that same number

two operations that undo each other

numbers that are easy to add, subtract,

multiply, or divide mentally

addends can be regrouped and the sum remains the same

numbers can be added in any order and

the sum remains the same

states that the sum of any number and zero is that same number

two operations that undo each other

numbers that are easy to add, subtract,

multiply, or divide mentally

addends can be regrouped and the sum remains the same

numbers can be added in any order and

the sum remains the same

states that the sum of any number and zero is that same number

two operations that undo each other

numbers that are easy to add, subtract,

multiply, or divide mentally

Doubles property of addition because the addends are equal. Doubles facts are always have an even sum.

Associative property of addition because each addend increases by 2, so the sums are the same.

Communitive property of addition because one addend increases by 1 and the other addend decreases by 1, so the sums are the same.

Communitive property of addition because the order of the addends change. Changing the order of the addends does not change the sum.

Identity property of addition because each sum is equal to one of its addends because zero added to a number is that number.

Zero property of multiplication because anything times 0 equals zero.

Identity property of addition because each product is equal to one of its addends because zero added to a number is that number.

Communitive property of addition because addends can be added in any order and the sum is the same.