When you ask "What number is halfway between 57 and 210?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=57 and Y=210.
To find the number halfway between 57 and 210, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 57 and 210 into our formula, we get:
(57 + 210)/2 = 133.5
Thus, the number halfway between 57 and 210 is 133.5.
To check that our answer is correct, we subtract 57 from 133.5 and subtract 133.5 from 210 and compare the two numbers:
133.5 - 57 = 76.5
210 - 133.5 = 76.5
As you can see, the halfway number is 76.5 higher than 57 and 76.5 lower than 210. Therefore, our halfway between answer of 133.5 above is correct.
Halfway Between
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Halfway Between 57 and 211
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