When you ask "What number is halfway between 20 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=20 and Y=221.
To find the number halfway between 20 and 221, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 221 into our formula, we get:
(20 + 221)/2 = 120.5
Thus, the number halfway between 20 and 221 is 120.5.
To check that our answer is correct, we subtract 20 from 120.5 and subtract 120.5 from 221 and compare the two numbers:
120.5 - 20 = 100.5
221 - 120.5 = 100.5
As you can see, the halfway number is 100.5 higher than 20 and 100.5 lower than 221. Therefore, our halfway between answer of 120.5 above is correct.
Halfway Between
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Halfway Between 20 and 222
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