When you ask "What number is halfway between 78 and 641?" 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=641.
To find the number halfway between 78 and 641, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 78 and 641 into our formula, we get:
(78 + 641)/2 = 359.5
Thus, the number halfway between 78 and 641 is 359.5.
To check that our answer is correct, we subtract 78 from 359.5 and subtract 359.5 from 641 and compare the two numbers:
359.5 - 78 = 281.5
641 - 359.5 = 281.5
As you can see, the halfway number is 281.5 higher than 78 and 281.5 lower than 641. Therefore, our halfway between answer of 359.5 above is correct.
Halfway Between
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Halfway Between 78 and 642
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