When you ask "What number is halfway between 12 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=12 and Y=221.
To find the number halfway between 12 and 221, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 221 into our formula, we get:
(12 + 221)/2 = 116.5
Thus, the number halfway between 12 and 221 is 116.5.
To check that our answer is correct, we subtract 12 from 116.5 and subtract 116.5 from 221 and compare the two numbers:
116.5 - 12 = 104.5
221 - 116.5 = 104.5
As you can see, the halfway number is 104.5 higher than 12 and 104.5 lower than 221. Therefore, our halfway between answer of 116.5 above is correct.
Halfway Between
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Halfway Between 12 and 222
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