When you ask "What number is halfway between 58 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=58 and Y=121.
To find the number halfway between 58 and 121, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 58 and 121 into our formula, we get:
(58 + 121)/2 = 89.5
Thus, the number halfway between 58 and 121 is 89.5.
To check that our answer is correct, we subtract 58 from 89.5 and subtract 89.5 from 121 and compare the two numbers:
89.5 - 58 = 31.5
121 - 89.5 = 31.5
As you can see, the halfway number is 31.5 higher than 58 and 31.5 lower than 121. Therefore, our halfway between answer of 89.5 above is correct.
Halfway Between
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Halfway Between 58 and 122
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