When you ask "What number is halfway between 12 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=12 and Y=257.
To find the number halfway between 12 and 257, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 257 into our formula, we get:
(12 + 257)/2 = 134.5
Thus, the number halfway between 12 and 257 is 134.5.
To check that our answer is correct, we subtract 12 from 134.5 and subtract 134.5 from 257 and compare the two numbers:
134.5 - 12 = 122.5
257 - 134.5 = 122.5
As you can see, the halfway number is 122.5 higher than 12 and 122.5 lower than 257. Therefore, our halfway between answer of 134.5 above is correct.
Halfway Between
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Halfway Between 12 and 258
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