When you ask "What number is halfway between 21 and 615?" 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=615.
To find the number halfway between 21 and 615, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 615 into our formula, we get:
(21 + 615)/2 = 318
Thus, the number halfway between 21 and 615 is 318.
To check that our answer is correct, we subtract 21 from 318 and subtract 318 from 615 and compare the two numbers:
318 - 21 = 297
615 - 318 = 297
As you can see, the halfway number is 297 higher than 21 and 297 lower than 615. Therefore, our halfway between answer of 318 above is correct.
Halfway Between
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Halfway Between 21 and 616
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