When you ask "What number is halfway between 21 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=21 and Y=221.
To find the number halfway between 21 and 221, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 221 into our formula, we get:
(21 + 221)/2 = 121
Thus, the number halfway between 21 and 221 is 121.
To check that our answer is correct, we subtract 21 from 121 and subtract 121 from 221 and compare the two numbers:
121 - 21 = 100
221 - 121 = 100
As you can see, the halfway number is 100 higher than 21 and 100 lower than 221. Therefore, our halfway between answer of 121 above is correct.
Halfway Between
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Halfway Between 21 and 222
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