When you ask "What number is halfway between 20 and 279?" 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=279.
To find the number halfway between 20 and 279, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 279 into our formula, we get:
(20 + 279)/2 = 149.5
Thus, the number halfway between 20 and 279 is 149.5.
To check that our answer is correct, we subtract 20 from 149.5 and subtract 149.5 from 279 and compare the two numbers:
149.5 - 20 = 129.5
279 - 149.5 = 129.5
As you can see, the halfway number is 129.5 higher than 20 and 129.5 lower than 279. Therefore, our halfway between answer of 149.5 above is correct.
Halfway Between
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Halfway Between 20 and 280
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