When you ask "What number is halfway between 87 and 888?" 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=888.
To find the number halfway between 87 and 888, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 888 into our formula, we get:
(87 + 888)/2 = 487.5
Thus, the number halfway between 87 and 888 is 487.5.
To check that our answer is correct, we subtract 87 from 487.5 and subtract 487.5 from 888 and compare the two numbers:
487.5 - 87 = 400.5
888 - 487.5 = 400.5
As you can see, the halfway number is 400.5 higher than 87 and 400.5 lower than 888. Therefore, our halfway between answer of 487.5 above is correct.
Halfway Between
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Halfway Between 87 and 889
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