math
You had 7 cookies on a plate, and you ate 3 of them.
4 is correct because you start with 7 cookies and take away the 3 you ate, and 7 minus 3 equals 4 — that's called subtracting, and it tells you how many cookies remain.
3 and 5 don't match; 3 is how many cookies you ate, not how many are left, and 5 doesn't match the starting amount or the correct result either.
You can check by adding back up: 4 cookies left plus the 3 you ate equals 7 — addition and subtraction are opposite moves that undo each other!
math
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