When you ask "What number is halfway between 87 and 159?" 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=159.
To find the number halfway between 87 and 159, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 159 into our formula, we get:
(87 + 159)/2 = 123
Thus, the number halfway between 87 and 159 is 123.
To check that our answer is correct, we subtract 87 from 123 and subtract 123 from 159 and compare the two numbers:
123 - 87 = 36
159 - 123 = 36
As you can see, the halfway number is 36 higher than 87 and 36 lower than 159. Therefore, our halfway between answer of 123 above is correct.
Halfway Between
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Halfway Between 87 and 160
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