When you ask "What number is halfway between 99 and 672?" 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=672.
To find the number halfway between 99 and 672, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 672 into our formula, we get:
(99 + 672)/2 = 385.5
Thus, the number halfway between 99 and 672 is 385.5.
To check that our answer is correct, we subtract 99 from 385.5 and subtract 385.5 from 672 and compare the two numbers:
385.5 - 99 = 286.5
672 - 385.5 = 286.5
As you can see, the halfway number is 286.5 higher than 99 and 286.5 lower than 672. Therefore, our halfway between answer of 385.5 above is correct.
Halfway Between
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Halfway Between 99 and 673
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