When you ask "What number is halfway between 99 and 724?" 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=724.
To find the number halfway between 99 and 724, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 724 into our formula, we get:
(99 + 724)/2 = 411.5
Thus, the number halfway between 99 and 724 is 411.5.
To check that our answer is correct, we subtract 99 from 411.5 and subtract 411.5 from 724 and compare the two numbers:
411.5 - 99 = 312.5
724 - 411.5 = 312.5
As you can see, the halfway number is 312.5 higher than 99 and 312.5 lower than 724. Therefore, our halfway between answer of 411.5 above is correct.
Halfway Between
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