When you ask "What number is halfway between 99 and 615?" 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=615.
To find the number halfway between 99 and 615, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 615 into our formula, we get:
(99 + 615)/2 = 357
Thus, the number halfway between 99 and 615 is 357.
To check that our answer is correct, we subtract 99 from 357 and subtract 357 from 615 and compare the two numbers:
357 - 99 = 258
615 - 357 = 258
As you can see, the halfway number is 258 higher than 99 and 258 lower than 615. Therefore, our halfway between answer of 357 above is correct.
Halfway Between
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Halfway Between 99 and 616
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