When you ask "What number is halfway between 78 and 207?" 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=207.
To find the number halfway between 78 and 207, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 78 and 207 into our formula, we get:
(78 + 207)/2 = 142.5
Thus, the number halfway between 78 and 207 is 142.5.
To check that our answer is correct, we subtract 78 from 142.5 and subtract 142.5 from 207 and compare the two numbers:
142.5 - 78 = 64.5
207 - 142.5 = 64.5
As you can see, the halfway number is 64.5 higher than 78 and 64.5 lower than 207. Therefore, our halfway between answer of 142.5 above is correct.
Halfway Between
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Halfway Between 78 and 208
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