To add 64 and 37 mentally, you can break it down like this:
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Recognize that 37 is 3 less than 40. You can use that to simplify the addition:
- 64 + 37 can be rewritten as 64 + (40 - 3).
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This can be rearranged to:
- 64 + 40 - 3.
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Now add 64 and 40:
- 64 + 40 = 104.
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Finally, subtract 3:
- 104 - 3 = 101.
So, the correct sum of 64 and 37 is 101.