When you ask "What number is halfway between 21 and 288?" 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=288.
To find the number halfway between 21 and 288, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 288 into our formula, we get:
(21 + 288)/2 = 154.5
Thus, the number halfway between 21 and 288 is 154.5.
To check that our answer is correct, we subtract 21 from 154.5 and subtract 154.5 from 288 and compare the two numbers:
154.5 - 21 = 133.5
288 - 154.5 = 133.5
As you can see, the halfway number is 133.5 higher than 21 and 133.5 lower than 288. Therefore, our halfway between answer of 154.5 above is correct.
Halfway Between
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Halfway Between 21 and 289
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