When you ask "What number is halfway between 15 and 772?" 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=772.
To find the number halfway between 15 and 772, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 772 into our formula, we get:
(15 + 772)/2 = 393.5
Thus, the number halfway between 15 and 772 is 393.5.
To check that our answer is correct, we subtract 15 from 393.5 and subtract 393.5 from 772 and compare the two numbers:
393.5 - 15 = 378.5
772 - 393.5 = 378.5
As you can see, the halfway number is 378.5 higher than 15 and 378.5 lower than 772. Therefore, our halfway between answer of 393.5 above is correct.
Halfway Between
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Halfway Between 15 and 773
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