When you ask "What number is halfway between 21 and 144?" 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=144.
To find the number halfway between 21 and 144, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 144 into our formula, we get:
(21 + 144)/2 = 82.5
Thus, the number halfway between 21 and 144 is 82.5.
To check that our answer is correct, we subtract 21 from 82.5 and subtract 82.5 from 144 and compare the two numbers:
82.5 - 21 = 61.5
144 - 82.5 = 61.5
As you can see, the halfway number is 61.5 higher than 21 and 61.5 lower than 144. Therefore, our halfway between answer of 82.5 above is correct.
Halfway Between
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Halfway Between 21 and 145
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