When you ask "What number is halfway between 99 and 677?" 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=677.
To find the number halfway between 99 and 677, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 677 into our formula, we get:
(99 + 677)/2 = 388
Thus, the number halfway between 99 and 677 is 388.
To check that our answer is correct, we subtract 99 from 388 and subtract 388 from 677 and compare the two numbers:
388 - 99 = 289
677 - 388 = 289
As you can see, the halfway number is 289 higher than 99 and 289 lower than 677. Therefore, our halfway between answer of 388 above is correct.
Halfway Between
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Halfway Between 99 and 678
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