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Math · Age 9 · Addition & Subtraction

Mental Addition and Subtraction Strategies (Ex. 1)

Use mental strategies such as adjusting and bridging.

Module

Addition & Subtraction

Age

Age 9

Duration

8 min

Questions

5

What's in this exercise

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  1. Question 1

    Multiple choice

    What is 3,998 + 5? (Hint: use adjusting: 4,000 + 5 − 2)

  2. Question 2

    Multiple choice

    Use bridging: 2,750 + 350 = ?

  3. Question 3

    Multiple choice

    What is 7,000 − 299? (Use adjusting: 7,000 − 300 + 1)

  4. Question 4

    Sequence

    3,000 + 999 = 3,999; 4,000 + 999 = 4,999; 5,000 + 999 = ___.

  5. Question 5

    True or false

    To add 199, you can add 200 then subtract 1.

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