When you ask "What number is halfway between 78 and 647?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=78 and Y=647.
To find the number halfway between 78 and 647, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 78 and 647 into our formula, we get:
(78 + 647)/2 = 362.5
Thus, the number halfway between 78 and 647 is 362.5.
To check that our answer is correct, we subtract 78 from 362.5 and subtract 362.5 from 647 and compare the two numbers:
362.5 - 78 = 284.5
647 - 362.5 = 284.5
As you can see, the halfway number is 284.5 higher than 78 and 284.5 lower than 647. Therefore, our halfway between answer of 362.5 above is correct.
Halfway Between
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Halfway Between 78 and 648
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