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  1. Estimate the sum or difference for each problem below. Choose the closest benchmark.
    1. Close to 0
    2. Close to
    3. Close to 1
    1. + =
    2. + =
    3. − =
    4. − =
    5. − =
    6. + =
    1. Choose 3 problems from Questions 17A–F and find exact answers. Show all of your work. For each problem, tell if your estimate is close to your calculation.
  2. Estimate the sum or difference for each problem below. Choose the closest benchmark.
    1. Close to 0
    2. Close to
    3. Close to 1
    4. Close to 2
    5. More than 2
    1. + =
    2. + =
    3. − =
    4. + + =
    5. + + =
    6. − =
    7. − 1 =
    8. 1 + =
    1. Choose 3 problems from Questions 18A–H and find exact answers. For each problem, use a different strategy or tool, show your work, and tell if your estimate is close to your calculation.