When you ask "What number is halfway between 21 and 140?" 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=140.
To find the number halfway between 21 and 140, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 140 into our formula, we get:
(21 + 140)/2 = 80.5
Thus, the number halfway between 21 and 140 is 80.5.
To check that our answer is correct, we subtract 21 from 80.5 and subtract 80.5 from 140 and compare the two numbers:
80.5 - 21 = 59.5
140 - 80.5 = 59.5
As you can see, the halfway number is 59.5 higher than 21 and 59.5 lower than 140. Therefore, our halfway between answer of 80.5 above is correct.
Halfway Between
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Halfway Between 21 and 141
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