1.   Find the sum. Identify the property.

(2 + 9) + 4 = ___

2 + (9 + 4) = ___
    A. 11; Commutative Property of Addition B. 0; Identity Property of Addition
    C. 15; Associative Property of Addition D. 13; Commutative Property of Addition
    Hint
  2.   Find the sum. Identify the property.

4 + 7 = ___

7 + 4 = ___
    A. 11; Commutative Property of Addition B. 11; Associative Property of Addition
    C. 11; Identity Property of Addition D. 7; Identity Property of Addition
    Hint
  3.   Find the missing number and identify the property.

8 + __ = 8
    A. 0; Identity Property of Addition B. 0; Commutative Property of Addition
    C. 8; Associative Property of Addition D. 8; Identity Property of Addition
    Hint
  4.   Find the missing number and identify the property.

(6 + 9) + 4 = (9 + __) + 4
    A. 6; Identity Property of Addition B. 9; Commutative Property of Addition
    C. 6; Commutative Property of Addition D. 6; Associative Property of Addition
    Hint
  5.   Find the sum mentally.

9 + 8 + 2
    A. 18 B. 17
    C. 10 D. 19
    Hint