1.   Estimate. Round to the nearest ten.

    A. 90 − 20 = 70 B. 90 − 30 = 60
    C. 100 − 20 = 80 D. 100 − 30 = 70
    Hint

  2.   Estimate. Round to the nearest hundred.

    A. 200 − 0 = 200 B. 150 − 50 = 100
    C. 180 − 60 = 120 D. 200 − 100 = 100
    Hint

  3.   Estimate. Round to the nearest hundred.

    A. 400 − 100 = 300 B. 480 − 130 = 350
    C. 480 − 130 = 350 D. 500 − 100 = 400
    Hint

  4.   Estimate. Round to the nearest ten or use compatible numbers.

62 − 38 = ___

    A. 70 − 30 = 40 B. 60 − 30 = 30
    C. 60 − 40 = 20 D. 70 − 40 = 30
    Hint

  5.   Estimate. Round to the nearest hundred.

425 − 298 = ___

    A. 400 − 300 = 100 B. 400 − 200 = 200
    C. 500 − 300 = 200 D. 430 − 300 = 130
    Hint