When you ask "What number is halfway between 21 and 110?" 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=110.
To find the number halfway between 21 and 110, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 110 into our formula, we get:
(21 + 110)/2 = 65.5
Thus, the number halfway between 21 and 110 is 65.5.
To check that our answer is correct, we subtract 21 from 65.5 and subtract 65.5 from 110 and compare the two numbers:
65.5 - 21 = 44.5
110 - 65.5 = 44.5
As you can see, the halfway number is 44.5 higher than 21 and 44.5 lower than 110. Therefore, our halfway between answer of 65.5 above is correct.
Halfway Between
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Halfway Between 21 and 111
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