When you ask "What number is halfway between 84 and 787?" 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=787.
To find the number halfway between 84 and 787, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 787 into our formula, we get:
(84 + 787)/2 = 435.5
Thus, the number halfway between 84 and 787 is 435.5.
To check that our answer is correct, we subtract 84 from 435.5 and subtract 435.5 from 787 and compare the two numbers:
435.5 - 84 = 351.5
787 - 435.5 = 351.5
As you can see, the halfway number is 351.5 higher than 84 and 351.5 lower than 787. Therefore, our halfway between answer of 435.5 above is correct.
Halfway Between
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Halfway Between 84 and 788
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