When you ask "What number is halfway between 21 and 68?" 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=68.
To find the number halfway between 21 and 68, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 68 into our formula, we get:
(21 + 68)/2 = 44.5
Thus, the number halfway between 21 and 68 is 44.5.
To check that our answer is correct, we subtract 21 from 44.5 and subtract 44.5 from 68 and compare the two numbers:
44.5 - 21 = 23.5
68 - 44.5 = 23.5
As you can see, the halfway number is 23.5 higher than 21 and 23.5 lower than 68. Therefore, our halfway between answer of 44.5 above is correct.
Halfway Between
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Halfway Between 21 and 69
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