When you ask "What number is halfway between 5 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=5 and Y=257.
To find the number halfway between 5 and 257, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 5 and 257 into our formula, we get:
(5 + 257)/2 = 131
Thus, the number halfway between 5 and 257 is 131.
To check that our answer is correct, we subtract 5 from 131 and subtract 131 from 257 and compare the two numbers:
131 - 5 = 126
257 - 131 = 126
As you can see, the halfway number is 126 higher than 5 and 126 lower than 257. Therefore, our halfway between answer of 131 above is correct.
Halfway Between
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Halfway Between 5 and 258
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