When you ask "What number is halfway between 21 and 597?" 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=597.
To find the number halfway between 21 and 597, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 597 into our formula, we get:
(21 + 597)/2 = 309
Thus, the number halfway between 21 and 597 is 309.
To check that our answer is correct, we subtract 21 from 309 and subtract 309 from 597 and compare the two numbers:
309 - 21 = 288
597 - 309 = 288
As you can see, the halfway number is 288 higher than 21 and 288 lower than 597. Therefore, our halfway between answer of 309 above is correct.
Halfway Between
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Halfway Between 21 and 598
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