When you ask "What number is halfway between 21 and 537?" 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=537.
To find the number halfway between 21 and 537, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 537 into our formula, we get:
(21 + 537)/2 = 279
Thus, the number halfway between 21 and 537 is 279.
To check that our answer is correct, we subtract 21 from 279 and subtract 279 from 537 and compare the two numbers:
279 - 21 = 258
537 - 279 = 258
As you can see, the halfway number is 258 higher than 21 and 258 lower than 537. Therefore, our halfway between answer of 279 above is correct.
Halfway Between
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Halfway Between 21 and 538
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