When you ask "What number is halfway between 55 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=55 and Y=172.
To find the number halfway between 55 and 172, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 55 and 172 into our formula, we get:
(55 + 172)/2 = 113.5
Thus, the number halfway between 55 and 172 is 113.5.
To check that our answer is correct, we subtract 55 from 113.5 and subtract 113.5 from 172 and compare the two numbers:
113.5 - 55 = 58.5
172 - 113.5 = 58.5
As you can see, the halfway number is 58.5 higher than 55 and 58.5 lower than 172. Therefore, our halfway between answer of 113.5 above is correct.
Halfway Between
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Halfway Between 55 and 173
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