When you ask "What number is halfway between 99 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=99 and Y=772.
To find the number halfway between 99 and 772, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 772 into our formula, we get:
(99 + 772)/2 = 435.5
Thus, the number halfway between 99 and 772 is 435.5.
To check that our answer is correct, we subtract 99 from 435.5 and subtract 435.5 from 772 and compare the two numbers:
435.5 - 99 = 336.5
772 - 435.5 = 336.5
As you can see, the halfway number is 336.5 higher than 99 and 336.5 lower than 772. Therefore, our halfway between answer of 435.5 above is correct.
Halfway Between
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Halfway Between 99 and 773
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