When you ask "What number is halfway between 11 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=11 and Y=172.
To find the number halfway between 11 and 172, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 11 and 172 into our formula, we get:
(11 + 172)/2 = 91.5
Thus, the number halfway between 11 and 172 is 91.5.
To check that our answer is correct, we subtract 11 from 91.5 and subtract 91.5 from 172 and compare the two numbers:
91.5 - 11 = 80.5
172 - 91.5 = 80.5
As you can see, the halfway number is 80.5 higher than 11 and 80.5 lower than 172. Therefore, our halfway between answer of 91.5 above is correct.
Halfway Between
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Halfway Between 11 and 173
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