When you ask "What number is halfway between 21 and 356?" 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=356.
To find the number halfway between 21 and 356, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 356 into our formula, we get:
(21 + 356)/2 = 188.5
Thus, the number halfway between 21 and 356 is 188.5.
To check that our answer is correct, we subtract 21 from 188.5 and subtract 188.5 from 356 and compare the two numbers:
188.5 - 21 = 167.5
356 - 188.5 = 167.5
As you can see, the halfway number is 167.5 higher than 21 and 167.5 lower than 356. Therefore, our halfway between answer of 188.5 above is correct.
Halfway Between
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Halfway Between 21 and 357
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