When you ask "What number is halfway between 12 and 171?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=12 and Y=171.
To find the number halfway between 12 and 171, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 171 into our formula, we get:
(12 + 171)/2 = 91.5
Thus, the number halfway between 12 and 171 is 91.5.
To check that our answer is correct, we subtract 12 from 91.5 and subtract 91.5 from 171 and compare the two numbers:
91.5 - 12 = 79.5
171 - 91.5 = 79.5
As you can see, the halfway number is 79.5 higher than 12 and 79.5 lower than 171. Therefore, our halfway between answer of 91.5 above is correct.
Halfway Between
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Halfway Between 12 and 172
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