Math · Age 9 · Addition & Subtraction
Mental Addition and Subtraction Strategies (Ex. 3)
Choose and use the best mental strategy.
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 9,500 − 4,500 mentally?
Question 2
Multiple choice
Use near doubles: 3,500 + 3,600 ≈ ?
Question 3
Multiple choice
What is 2,999 + 3,001?
Question 4
Sequence
2,000 + 2,000 = 4,000; 3,000 + 3,000 = 6,000; 4,000 + 4,000 = ___.
Question 5
True or false
To subtract 501, you can subtract 500 then subtract 1.