1.   Solve.

    A. 17 B. 82
    C. 71 D. 81
    Hint

  2.   Solve.

    A. 95 B. 105
    C. 39 D. 85
    Hint

  3.   Find the number that completes the number sentence. Then identify the property or rule.

(21 + 13) + 56 = 21 + ( __ + 56)

    A. 13; Associative Property of Addition
    B. 13; Commutative Property of Addition
    C. 21; Identity Property of Addition
    D. 35; Subtraction Rule
    Hint

  4.   Add mentally.

51 + 22 + 9

    A. 72 B. 82
    C. 92 D. 81
    Hint

  5.   Estimate. Round to the indicated place value.

1,982 + 2,301; thousands

    A. 2,000 + 3,000 = 5,000 B. 1,000 + 2,500 = 3,500
    C. 1,000 + 2,000 = 3,000 D. 2,000 + 2,000 = 4,000
    Hint

  6.   Estimate. Round to the indicated place value.

$82.60 − $41.39; tens

    A. $80 − $50 = $30 B. $90 − $45 = $45
    C. $90 − $40 = $50 D. $80 − $40 = $40
    Hint

  7.   Solve.

    A. 1,068 B. 1,158
    C. 1,268 D. 1,168
    Hint

  8.   In which sum will you need to regroup when you add?
    A. B.
    C. D.
    Hint

  9.   Find 489 − 399.
    A. 80 B. 180
    C. 90 D. 190
    Hint

  10.   Subtract.

    A. 4,254 B. 5,254
    C. 5,264 D. 5,256
    Hint

  11.   Solve.

    A. 644 B. 634
    C. 566 D. 534
    Hint

  12.   Solve.

    A. 159 B. 141
    C. 59 D. 61
    Hint