When you ask "What number is halfway between 87 and 126?" 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=126.
To find the number halfway between 87 and 126, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 126 into our formula, we get:
(87 + 126)/2 = 106.5
Thus, the number halfway between 87 and 126 is 106.5.
To check that our answer is correct, we subtract 87 from 106.5 and subtract 106.5 from 126 and compare the two numbers:
106.5 - 87 = 19.5
126 - 106.5 = 19.5
As you can see, the halfway number is 19.5 higher than 87 and 19.5 lower than 126. Therefore, our halfway between answer of 106.5 above is correct.
Halfway Between
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Halfway Between 87 and 127
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