When you ask "What number is halfway between 87 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=87 and Y=158.
To find the number halfway between 87 and 158, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 158 into our formula, we get:
(87 + 158)/2 = 122.5
Thus, the number halfway between 87 and 158 is 122.5.
To check that our answer is correct, we subtract 87 from 122.5 and subtract 122.5 from 158 and compare the two numbers:
122.5 - 87 = 35.5
158 - 122.5 = 35.5
As you can see, the halfway number is 35.5 higher than 87 and 35.5 lower than 158. Therefore, our halfway between answer of 122.5 above is correct.
Halfway Between
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Halfway Between 87 and 159
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