When you ask "What number is halfway between 20 and 278?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=20 and Y=278.
To find the number halfway between 20 and 278, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 278 into our formula, we get:
(20 + 278)/2 = 149
Thus, the number halfway between 20 and 278 is 149.
To check that our answer is correct, we subtract 20 from 149 and subtract 149 from 278 and compare the two numbers:
149 - 20 = 129
278 - 149 = 129
As you can see, the halfway number is 129 higher than 20 and 129 lower than 278. Therefore, our halfway between answer of 149 above is correct.
Halfway Between
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Halfway Between 20 and 279
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