When you ask "What number is halfway between 21 and 121?" 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=121.
To find the number halfway between 21 and 121, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 121 into our formula, we get:
(21 + 121)/2 = 71
Thus, the number halfway between 21 and 121 is 71.
To check that our answer is correct, we subtract 21 from 71 and subtract 71 from 121 and compare the two numbers:
71 - 21 = 50
121 - 71 = 50
As you can see, the halfway number is 50 higher than 21 and 50 lower than 121. Therefore, our halfway between answer of 71 above is correct.
Halfway Between
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Halfway Between 21 and 122
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