When you ask "What number is halfway between 7 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=7 and Y=172.
To find the number halfway between 7 and 172, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 7 and 172 into our formula, we get:
(7 + 172)/2 = 89.5
Thus, the number halfway between 7 and 172 is 89.5.
To check that our answer is correct, we subtract 7 from 89.5 and subtract 89.5 from 172 and compare the two numbers:
89.5 - 7 = 82.5
172 - 89.5 = 82.5
As you can see, the halfway number is 82.5 higher than 7 and 82.5 lower than 172. Therefore, our halfway between answer of 89.5 above is correct.
Halfway Between
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Halfway Between 7 and 173
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