When you ask "What number is halfway between 87 and 150?" 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=150.
To find the number halfway between 87 and 150, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 150 into our formula, we get:
(87 + 150)/2 = 118.5
Thus, the number halfway between 87 and 150 is 118.5.
To check that our answer is correct, we subtract 87 from 118.5 and subtract 118.5 from 150 and compare the two numbers:
118.5 - 87 = 31.5
150 - 118.5 = 31.5
As you can see, the halfway number is 31.5 higher than 87 and 31.5 lower than 150. Therefore, our halfway between answer of 118.5 above is correct.
Halfway Between
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Halfway Between 87 and 151
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