When you ask "What number is halfway between 57 and 189?" 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=189.
To find the number halfway between 57 and 189, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 57 and 189 into our formula, we get:
(57 + 189)/2 = 123
Thus, the number halfway between 57 and 189 is 123.
To check that our answer is correct, we subtract 57 from 123 and subtract 123 from 189 and compare the two numbers:
123 - 57 = 66
189 - 123 = 66
As you can see, the halfway number is 66 higher than 57 and 66 lower than 189. Therefore, our halfway between answer of 123 above is correct.
Halfway Between
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Halfway Between 57 and 190
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