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Mathematical Communication and Explanation Choices
Worksheet
Grade Level
Grade 3
3.144 Mathematical Communication and Explanation Choices
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A student solves 602 − 398 by subtracting 400 to get 202, then adding 2 to get 204.
Which statement best explains why the student adds 2?
A
Because subtracting 400 is the same as subtracting 398.
B
Because you always add 2 after subtracting any number close to 400.
C
Because 602 − 398 must end in 2.
D
Because 400 is 2 more than 398, so subtracting 400 subtracts 2 too many and adding 2 corrects it.
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