Mathematics 3
Addition and Subtraction Assignment Answer Key
Day 18: Looking Back

3. Step 1: Understand the Problem.
    Step 2: Make a Plan.
    Step 3: Try the Plan.
    Step 4: Look Back.

4. The student will need to add 60 + 15 = 75 to find how many minutes Aziz has watched television so far. Then the student must subtract to find how many minutes of viewing time is left, 90 - 75 = 15 . Aziz can watch television for another 15 minutes.

5. a. $58    $52 + $4 + $2 = $58

    b. about $70     $10 + $40 + $20 = $70

6. subtract

7. $25    $89 - $64 = $25

Challenge Question

1. a. roller blades, bicycle
    b. Yes, the video game, skates, and bicycle also add up to $89.

Timed Exercise

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