When you ask "What number is halfway between 57 and 121?" 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=121.
To find the number halfway between 57 and 121, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 57 and 121 into our formula, we get:
(57 + 121)/2 = 89
Thus, the number halfway between 57 and 121 is 89.
To check that our answer is correct, we subtract 57 from 89 and subtract 89 from 121 and compare the two numbers:
89 - 57 = 32
121 - 89 = 32
As you can see, the halfway number is 32 higher than 57 and 32 lower than 121. Therefore, our halfway between answer of 89 above is correct.
Halfway Between
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Halfway Between 57 and 122
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