Final answer:
The correct math expression for 100 less than 125 is 125 - 100.
Step-by-step explanation:
The correct math expression for 100 less than 125 is A. 125 - 100. Subtraction is used when we want to find the result of taking away or removing a certain amount from another number. In this case, we want to find what 100 less than 125 is, so we subtract 100 from 125.
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