Name:______________ 1, Write each missing number.
3 + 5 + 3 = + 3	5 + ( 4 + 2) = 5 +
4 + = 5 + 4	+ 0 = 0 + 6
(3 + 3 ) + = 6 + 1	+ ( 3 + 6) = 2 + 9
0 + = 8	+ 4 = 4
2, Write to explain (3 + 2 ) + 7 = 5 + 7 __________________________________________________ __________________________________________________
3, Which property of addition is shown in this number sentence? Explain your answer. 2 + 3 = 3 + 2 __________________________________________________ __________________________________________________
4, Which number sentence shows the identity property of addition? 2 + 3 = 3 + 2 2 + ( 1 + 3 ) = (2 + 1) + 3 0 + 8 = 8