When you ask "What number is halfway between 100 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=100 and Y=787.
To find the number halfway between 100 and 787, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 787 into our formula, we get:
(100 + 787)/2 = 443.5
Thus, the number halfway between 100 and 787 is 443.5.
To check that our answer is correct, we subtract 100 from 443.5 and subtract 443.5 from 787 and compare the two numbers:
443.5 - 100 = 343.5
787 - 443.5 = 343.5
As you can see, the halfway number is 343.5 higher than 100 and 343.5 lower than 787. Therefore, our halfway between answer of 443.5 above is correct.
Halfway Between
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Halfway Between 100 and 788
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