When you ask "What number is halfway between 58 and 221?" 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=221.
To find the number halfway between 58 and 221, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 58 and 221 into our formula, we get:
(58 + 221)/2 = 139.5
Thus, the number halfway between 58 and 221 is 139.5.
To check that our answer is correct, we subtract 58 from 139.5 and subtract 139.5 from 221 and compare the two numbers:
139.5 - 58 = 81.5
221 - 139.5 = 81.5
As you can see, the halfway number is 81.5 higher than 58 and 81.5 lower than 221. Therefore, our halfway between answer of 139.5 above is correct.
Halfway Between
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Halfway Between 58 and 222
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