When you ask "What number is halfway between 91 and 170?" 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=170.
To find the number halfway between 91 and 170, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 91 and 170 into our formula, we get:
(91 + 170)/2 = 130.5
Thus, the number halfway between 91 and 170 is 130.5.
To check that our answer is correct, we subtract 91 from 130.5 and subtract 130.5 from 170 and compare the two numbers:
130.5 - 91 = 39.5
170 - 130.5 = 39.5
As you can see, the halfway number is 39.5 higher than 91 and 39.5 lower than 170. Therefore, our halfway between answer of 130.5 above is correct.
Halfway Between
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Halfway Between 91 and 171
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