When you ask "What number is halfway between 30 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=30 and Y=257.
To find the number halfway between 30 and 257, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 257 into our formula, we get:
(30 + 257)/2 = 143.5
Thus, the number halfway between 30 and 257 is 143.5.
To check that our answer is correct, we subtract 30 from 143.5 and subtract 143.5 from 257 and compare the two numbers:
143.5 - 30 = 113.5
257 - 143.5 = 113.5
As you can see, the halfway number is 113.5 higher than 30 and 113.5 lower than 257. Therefore, our halfway between answer of 143.5 above is correct.
Halfway Between
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Halfway Between 30 and 258
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