When you ask "What number is halfway between 15 and 170?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=15 and Y=170.
To find the number halfway between 15 and 170, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 170 into our formula, we get:
(15 + 170)/2 = 92.5
Thus, the number halfway between 15 and 170 is 92.5.
To check that our answer is correct, we subtract 15 from 92.5 and subtract 92.5 from 170 and compare the two numbers:
92.5 - 15 = 77.5
170 - 92.5 = 77.5
As you can see, the halfway number is 77.5 higher than 15 and 77.5 lower than 170. Therefore, our halfway between answer of 92.5 above is correct.
Halfway Between
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Halfway Between 15 and 171
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