When you ask "What number is halfway between 79 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=79 and Y=172.
To find the number halfway between 79 and 172, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 79 and 172 into our formula, we get:
(79 + 172)/2 = 125.5
Thus, the number halfway between 79 and 172 is 125.5.
To check that our answer is correct, we subtract 79 from 125.5 and subtract 125.5 from 172 and compare the two numbers:
125.5 - 79 = 46.5
172 - 125.5 = 46.5
As you can see, the halfway number is 46.5 higher than 79 and 46.5 lower than 172. Therefore, our halfway between answer of 125.5 above is correct.
Halfway Between
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Halfway Between 79 and 173
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