When you ask "What number is halfway between 99 and 610?" 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=610.
To find the number halfway between 99 and 610, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 610 into our formula, we get:
(99 + 610)/2 = 354.5
Thus, the number halfway between 99 and 610 is 354.5.
To check that our answer is correct, we subtract 99 from 354.5 and subtract 354.5 from 610 and compare the two numbers:
354.5 - 99 = 255.5
610 - 354.5 = 255.5
As you can see, the halfway number is 255.5 higher than 99 and 255.5 lower than 610. Therefore, our halfway between answer of 354.5 above is correct.
Halfway Between
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Halfway Between 99 and 611
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