When you ask "What number is halfway between 87 and 142?" 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=142.
To find the number halfway between 87 and 142, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 142 into our formula, we get:
(87 + 142)/2 = 114.5
Thus, the number halfway between 87 and 142 is 114.5.
To check that our answer is correct, we subtract 87 from 114.5 and subtract 114.5 from 142 and compare the two numbers:
114.5 - 87 = 27.5
142 - 114.5 = 27.5
As you can see, the halfway number is 27.5 higher than 87 and 27.5 lower than 142. Therefore, our halfway between answer of 114.5 above is correct.
Halfway Between
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Halfway Between 87 and 143
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