When you ask "What number is halfway between 91 and 172?" 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=172.
To find the number halfway between 91 and 172, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 91 and 172 into our formula, we get:
(91 + 172)/2 = 131.5
Thus, the number halfway between 91 and 172 is 131.5.
To check that our answer is correct, we subtract 91 from 131.5 and subtract 131.5 from 172 and compare the two numbers:
131.5 - 91 = 40.5
172 - 131.5 = 40.5
As you can see, the halfway number is 40.5 higher than 91 and 40.5 lower than 172. Therefore, our halfway between answer of 131.5 above is correct.
Halfway Between
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Halfway Between 91 and 173
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