When you ask "What number is halfway between 8 and 87?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=8 and Y=87.
To find the number halfway between 8 and 87, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 8 and 87 into our formula, we get:
(8 + 87)/2 = 47.5
Thus, the number halfway between 8 and 87 is 47.5.
To check that our answer is correct, we subtract 8 from 47.5 and subtract 47.5 from 87 and compare the two numbers:
47.5 - 8 = 39.5
87 - 47.5 = 39.5
As you can see, the halfway number is 39.5 higher than 8 and 39.5 lower than 87. Therefore, our halfway between answer of 47.5 above is correct.
Halfway Between
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Halfway Between 8 and 88
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