When you ask "What number is halfway between 21 and 316?" 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=316.
To find the number halfway between 21 and 316, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 316 into our formula, we get:
(21 + 316)/2 = 168.5
Thus, the number halfway between 21 and 316 is 168.5.
To check that our answer is correct, we subtract 21 from 168.5 and subtract 168.5 from 316 and compare the two numbers:
168.5 - 21 = 147.5
316 - 168.5 = 147.5
As you can see, the halfway number is 147.5 higher than 21 and 147.5 lower than 316. Therefore, our halfway between answer of 168.5 above is correct.
Halfway Between
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Halfway Between 21 and 317
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