When you ask "What number is halfway between 21 and 177?" 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=177.
To find the number halfway between 21 and 177, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 177 into our formula, we get:
(21 + 177)/2 = 99
Thus, the number halfway between 21 and 177 is 99.
To check that our answer is correct, we subtract 21 from 99 and subtract 99 from 177 and compare the two numbers:
99 - 21 = 78
177 - 99 = 78
As you can see, the halfway number is 78 higher than 21 and 78 lower than 177. Therefore, our halfway between answer of 99 above is correct.
Halfway Between
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Halfway Between 21 and 178
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