When you ask "What number is halfway between 21 and 272?" 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=272.
To find the number halfway between 21 and 272, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 272 into our formula, we get:
(21 + 272)/2 = 146.5
Thus, the number halfway between 21 and 272 is 146.5.
To check that our answer is correct, we subtract 21 from 146.5 and subtract 146.5 from 272 and compare the two numbers:
146.5 - 21 = 125.5
272 - 146.5 = 125.5
As you can see, the halfway number is 125.5 higher than 21 and 125.5 lower than 272. Therefore, our halfway between answer of 146.5 above is correct.
Halfway Between
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Halfway Between 21 and 273
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