When you ask "What number is halfway between 27 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=27 and Y=172.
To find the number halfway between 27 and 172, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 27 and 172 into our formula, we get:
(27 + 172)/2 = 99.5
Thus, the number halfway between 27 and 172 is 99.5.
To check that our answer is correct, we subtract 27 from 99.5 and subtract 99.5 from 172 and compare the two numbers:
99.5 - 27 = 72.5
172 - 99.5 = 72.5
As you can see, the halfway number is 72.5 higher than 27 and 72.5 lower than 172. Therefore, our halfway between answer of 99.5 above is correct.
Halfway Between
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Halfway Between 27 and 173
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