When you ask "What number is halfway between 15 and 721?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=15 and Y=721.
To find the number halfway between 15 and 721, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 721 into our formula, we get:
(15 + 721)/2 = 368
Thus, the number halfway between 15 and 721 is 368.
To check that our answer is correct, we subtract 15 from 368 and subtract 368 from 721 and compare the two numbers:
368 - 15 = 353
721 - 368 = 353
As you can see, the halfway number is 353 higher than 15 and 353 lower than 721. Therefore, our halfway between answer of 368 above is correct.
Halfway Between
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Halfway Between 15 and 722
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