When you ask "What number is halfway between 10 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=10 and Y=257.
To find the number halfway between 10 and 257, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 10 and 257 into our formula, we get:
(10 + 257)/2 = 133.5
Thus, the number halfway between 10 and 257 is 133.5.
To check that our answer is correct, we subtract 10 from 133.5 and subtract 133.5 from 257 and compare the two numbers:
133.5 - 10 = 123.5
257 - 133.5 = 123.5
As you can see, the halfway number is 123.5 higher than 10 and 123.5 lower than 257. Therefore, our halfway between answer of 133.5 above is correct.
Halfway Between
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Halfway Between 10 and 258
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