When you ask "What number is halfway between 84 and 987?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=84 and Y=987.
To find the number halfway between 84 and 987, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 987 into our formula, we get:
(84 + 987)/2 = 535.5
Thus, the number halfway between 84 and 987 is 535.5.
To check that our answer is correct, we subtract 84 from 535.5 and subtract 535.5 from 987 and compare the two numbers:
535.5 - 84 = 451.5
987 - 535.5 = 451.5
As you can see, the halfway number is 451.5 higher than 84 and 451.5 lower than 987. Therefore, our halfway between answer of 535.5 above is correct.
Halfway Between
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Halfway Between 84 and 988
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