When you ask "What number is halfway between 99 and 630?" 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=630.
To find the number halfway between 99 and 630, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 630 into our formula, we get:
(99 + 630)/2 = 364.5
Thus, the number halfway between 99 and 630 is 364.5.
To check that our answer is correct, we subtract 99 from 364.5 and subtract 364.5 from 630 and compare the two numbers:
364.5 - 99 = 265.5
630 - 364.5 = 265.5
As you can see, the halfway number is 265.5 higher than 99 and 265.5 lower than 630. Therefore, our halfway between answer of 364.5 above is correct.
Halfway Between
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Halfway Between 99 and 631
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