When you ask "What number is halfway between 91 and 166?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=91 and Y=166.
To find the number halfway between 91 and 166, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 91 and 166 into our formula, we get:
(91 + 166)/2 = 128.5
Thus, the number halfway between 91 and 166 is 128.5.
To check that our answer is correct, we subtract 91 from 128.5 and subtract 128.5 from 166 and compare the two numbers:
128.5 - 91 = 37.5
166 - 128.5 = 37.5
As you can see, the halfway number is 37.5 higher than 91 and 37.5 lower than 166. Therefore, our halfway between answer of 128.5 above is correct.
Halfway Between
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Halfway Between 91 and 167
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