When you ask "What number is halfway between 20 and 277?" 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=277.
To find the number halfway between 20 and 277, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 277 into our formula, we get:
(20 + 277)/2 = 148.5
Thus, the number halfway between 20 and 277 is 148.5.
To check that our answer is correct, we subtract 20 from 148.5 and subtract 148.5 from 277 and compare the two numbers:
148.5 - 20 = 128.5
277 - 148.5 = 128.5
As you can see, the halfway number is 128.5 higher than 20 and 128.5 lower than 277. Therefore, our halfway between answer of 148.5 above is correct.
Halfway Between
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Halfway Between 20 and 278
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