When you ask "What number is halfway between 21 and 403?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=21 and Y=403.
To find the number halfway between 21 and 403, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 403 into our formula, we get:
(21 + 403)/2 = 212
Thus, the number halfway between 21 and 403 is 212.
To check that our answer is correct, we subtract 21 from 212 and subtract 212 from 403 and compare the two numbers:
212 - 21 = 191
403 - 212 = 191
As you can see, the halfway number is 191 higher than 21 and 191 lower than 403. Therefore, our halfway between answer of 212 above is correct.
Halfway Between
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Halfway Between 21 and 404
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