When you ask "What number is halfway between 1 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=1 and Y=257.
To find the number halfway between 1 and 257, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 1 and 257 into our formula, we get:
(1 + 257)/2 = 129
Thus, the number halfway between 1 and 257 is 129.
To check that our answer is correct, we subtract 1 from 129 and subtract 129 from 257 and compare the two numbers:
129 - 1 = 128
257 - 129 = 128
As you can see, the halfway number is 128 higher than 1 and 128 lower than 257. Therefore, our halfway between answer of 129 above is correct.
Halfway Between
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Halfway Between 1 and 258
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