When you ask "What number is halfway between 72 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=72 and Y=221.
To find the number halfway between 72 and 221, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 72 and 221 into our formula, we get:
(72 + 221)/2 = 146.5
Thus, the number halfway between 72 and 221 is 146.5.
To check that our answer is correct, we subtract 72 from 146.5 and subtract 146.5 from 221 and compare the two numbers:
146.5 - 72 = 74.5
221 - 146.5 = 74.5
As you can see, the halfway number is 74.5 higher than 72 and 74.5 lower than 221. Therefore, our halfway between answer of 146.5 above is correct.
Halfway Between
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Halfway Between 72 and 222
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