1.   Find the sum.

93 + 178 = ___

    A. 271 B. 171
    C. 161 D. 1,081
    Hint

  2.   Find the sum.

278 + 187 = ___

    A. 355 B. 365
    C. 455 D. 465
    Hint

  3.   Find the sum.

    A. 591 B. 691
    C. 601 D. 501
    Hint

  4.   Find the sum.

    A. $490 B. $590
    C. $400 D. $500
    Hint

  5.   Why is it a good idea to check answers for reasonableness?
    A. Many careless mistakes can be caught this way. B. Any mistake can be caught by using estimation to check your answers.
    C. Using estimation to check your answers gives exact results. D. Checking for reasonableness uses the Identity Property.
    Hint