When you ask "What number is halfway between 90 and 108?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=90 and Y=108.
To find the number halfway between 90 and 108, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 90 and 108 into our formula, we get:
(90 + 108)/2 = 99
Thus, the number halfway between 90 and 108 is 99.
To check that our answer is correct, we subtract 90 from 99 and subtract 99 from 108 and compare the two numbers:
99 - 90 = 9
108 - 99 = 9
As you can see, the halfway number is 9 higher than 90 and 9 lower than 108. Therefore, our halfway between answer of 99 above is correct.
Halfway Between
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Halfway Between 90 and 109
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