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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Question 1
Multiple choice
What is 3,998 + 5? (Hint: use adjusting: 4,000 + 5 − 2)
Question 2
Multiple choice
Use bridging: 2,750 + 350 = ?
Question 3
Multiple choice
What is 7,000 − 299? (Use adjusting: 7,000 − 300 + 1)
Question 4
Sequence
3,000 + 999 = 3,999; 4,000 + 999 = 4,999; 5,000 + 999 = ___.
Question 5
True or false
To add 199, you can add 200 then subtract 1.