When you ask "What number is halfway between 71 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=71 and Y=108.
To find the number halfway between 71 and 108, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 71 and 108 into our formula, we get:
(71 + 108)/2 = 89.5
Thus, the number halfway between 71 and 108 is 89.5.
To check that our answer is correct, we subtract 71 from 89.5 and subtract 89.5 from 108 and compare the two numbers:
89.5 - 71 = 18.5
108 - 89.5 = 18.5
As you can see, the halfway number is 18.5 higher than 71 and 18.5 lower than 108. Therefore, our halfway between answer of 89.5 above is correct.
Halfway Between
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Halfway Between 71 and 109
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