When you ask "What number is halfway between 13 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=13 and Y=158.
To find the number halfway between 13 and 158, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 13 and 158 into our formula, we get:
(13 + 158)/2 = 85.5
Thus, the number halfway between 13 and 158 is 85.5.
To check that our answer is correct, we subtract 13 from 85.5 and subtract 85.5 from 158 and compare the two numbers:
85.5 - 13 = 72.5
158 - 85.5 = 72.5
As you can see, the halfway number is 72.5 higher than 13 and 72.5 lower than 158. Therefore, our halfway between answer of 85.5 above is correct.
Halfway Between
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Halfway Between 13 and 159
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