1.   Find the sum. Identify the property.

(2 + 9) + 4 = ___

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

15 + 0 = ___
    A. 15; Commutative Property of Addition B. 15; Associative Property of Addition
    C. 15; Identity Property of Addition D. 0; Identity Property of Addition
    Hint
  3.   Find the sum. Identify the property.

4 + 7 = ___

7 + 4 = ___
    A. 11; Identity Property of Addition B. 11; Commutative Property of Addition
    C. 7; Identity Property of Addition D. 11; Associative Property of Addition
    Hint
  4.   Find the sum mentally.

5 + 9 + 5
    A. 21 B. 14
    C. 15 D. 19
    Hint
  5.   Find the sum mentally.

5 + 7 + 1 + 3
    A. 16 B. 15
    C. 20 D. 10
    Hint