When you ask "What number is halfway between 21 and 84?" 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=84.
To find the number halfway between 21 and 84, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 84 into our formula, we get:
(21 + 84)/2 = 52.5
Thus, the number halfway between 21 and 84 is 52.5.
To check that our answer is correct, we subtract 21 from 52.5 and subtract 52.5 from 84 and compare the two numbers:
52.5 - 21 = 31.5
84 - 52.5 = 31.5
As you can see, the halfway number is 31.5 higher than 21 and 31.5 lower than 84. Therefore, our halfway between answer of 52.5 above is correct.
Halfway Between
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Halfway Between 21 and 85
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