When you ask "What number is halfway between 20 and 257?" 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=257.
To find the number halfway between 20 and 257, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 257 into our formula, we get:
(20 + 257)/2 = 138.5
Thus, the number halfway between 20 and 257 is 138.5.
To check that our answer is correct, we subtract 20 from 138.5 and subtract 138.5 from 257 and compare the two numbers:
138.5 - 20 = 118.5
257 - 138.5 = 118.5
As you can see, the halfway number is 118.5 higher than 20 and 118.5 lower than 257. Therefore, our halfway between answer of 138.5 above is correct.
Halfway Between
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Halfway Between 20 and 258
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