When you ask "What number is halfway between 21 and 523?" 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=523.
To find the number halfway between 21 and 523, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 523 into our formula, we get:
(21 + 523)/2 = 272
Thus, the number halfway between 21 and 523 is 272.
To check that our answer is correct, we subtract 21 from 272 and subtract 272 from 523 and compare the two numbers:
272 - 21 = 251
523 - 272 = 251
As you can see, the halfway number is 251 higher than 21 and 251 lower than 523. Therefore, our halfway between answer of 272 above is correct.
Halfway Between
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Halfway Between 21 and 524
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