When you ask "What number is halfway between 20 and 220?" 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=220.
To find the number halfway between 20 and 220, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 220 into our formula, we get:
(20 + 220)/2 = 120
Thus, the number halfway between 20 and 220 is 120.
To check that our answer is correct, we subtract 20 from 120 and subtract 120 from 220 and compare the two numbers:
120 - 20 = 100
220 - 120 = 100
As you can see, the halfway number is 100 higher than 20 and 100 lower than 220. Therefore, our halfway between answer of 120 above is correct.
Halfway Between
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Halfway Between 20 and 221
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