When you ask "What number is halfway between 21 and 157?" 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=157.
To find the number halfway between 21 and 157, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 157 into our formula, we get:
(21 + 157)/2 = 89
Thus, the number halfway between 21 and 157 is 89.
To check that our answer is correct, we subtract 21 from 89 and subtract 89 from 157 and compare the two numbers:
89 - 21 = 68
157 - 89 = 68
As you can see, the halfway number is 68 higher than 21 and 68 lower than 157. Therefore, our halfway between answer of 89 above is correct.
Halfway Between
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Halfway Between 21 and 158
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