When you ask "What number is halfway between 30 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=30 and Y=787.
To find the number halfway between 30 and 787, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 787 into our formula, we get:
(30 + 787)/2 = 408.5
Thus, the number halfway between 30 and 787 is 408.5.
To check that our answer is correct, we subtract 30 from 408.5 and subtract 408.5 from 787 and compare the two numbers:
408.5 - 30 = 378.5
787 - 408.5 = 378.5
As you can see, the halfway number is 378.5 higher than 30 and 378.5 lower than 787. Therefore, our halfway between answer of 408.5 above is correct.
Halfway Between
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Halfway Between 30 and 788
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