When you ask "What number is halfway between 42 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=42 and Y=257.
To find the number halfway between 42 and 257, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 257 into our formula, we get:
(42 + 257)/2 = 149.5
Thus, the number halfway between 42 and 257 is 149.5.
To check that our answer is correct, we subtract 42 from 149.5 and subtract 149.5 from 257 and compare the two numbers:
149.5 - 42 = 107.5
257 - 149.5 = 107.5
As you can see, the halfway number is 107.5 higher than 42 and 107.5 lower than 257. Therefore, our halfway between answer of 149.5 above is correct.
Halfway Between
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Halfway Between 42 and 258
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