When you ask "What number is halfway between 100 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=100 and Y=257.
To find the number halfway between 100 and 257, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 257 into our formula, we get:
(100 + 257)/2 = 178.5
Thus, the number halfway between 100 and 257 is 178.5.
To check that our answer is correct, we subtract 100 from 178.5 and subtract 178.5 from 257 and compare the two numbers:
178.5 - 100 = 78.5
257 - 178.5 = 78.5
As you can see, the halfway number is 78.5 higher than 100 and 78.5 lower than 257. Therefore, our halfway between answer of 178.5 above is correct.
Halfway Between
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Halfway Between 100 and 258
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