When you ask "What number is halfway between 99 and 717?" 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=717.
To find the number halfway between 99 and 717, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 717 into our formula, we get:
(99 + 717)/2 = 408
Thus, the number halfway between 99 and 717 is 408.
To check that our answer is correct, we subtract 99 from 408 and subtract 408 from 717 and compare the two numbers:
408 - 99 = 309
717 - 408 = 309
As you can see, the halfway number is 309 higher than 99 and 309 lower than 717. Therefore, our halfway between answer of 408 above is correct.
Halfway Between
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Halfway Between 99 and 718
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