When you ask "What number is halfway between 15 and 158?" 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=158.
To find the number halfway between 15 and 158, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 158 into our formula, we get:
(15 + 158)/2 = 86.5
Thus, the number halfway between 15 and 158 is 86.5.
To check that our answer is correct, we subtract 15 from 86.5 and subtract 86.5 from 158 and compare the two numbers:
86.5 - 15 = 71.5
158 - 86.5 = 71.5
As you can see, the halfway number is 71.5 higher than 15 and 71.5 lower than 158. Therefore, our halfway between answer of 86.5 above is correct.
Halfway Between
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Halfway Between 15 and 159
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