When you ask "What number is halfway between 78 and 220?" 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=220.
To find the number halfway between 78 and 220, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 78 and 220 into our formula, we get:
(78 + 220)/2 = 149
Thus, the number halfway between 78 and 220 is 149.
To check that our answer is correct, we subtract 78 from 149 and subtract 149 from 220 and compare the two numbers:
149 - 78 = 71
220 - 149 = 71
As you can see, the halfway number is 71 higher than 78 and 71 lower than 220. Therefore, our halfway between answer of 149 above is correct.
Halfway Between
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Halfway Between 78 and 221
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