When you ask "What number is halfway between 16 and 21?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=16 and Y=21.
To find the number halfway between 16 and 21, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 16 and 21 into our formula, we get:
(16 + 21)/2 = 18.5
Thus, the number halfway between 16 and 21 is 18.5.
To check that our answer is correct, we subtract 16 from 18.5 and subtract 18.5 from 21 and compare the two numbers:
18.5 - 16 = 2.5
21 - 18.5 = 2.5
As you can see, the halfway number is 2.5 higher than 16 and 2.5 lower than 21. Therefore, our halfway between answer of 18.5 above is correct.
Halfway Between
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Halfway Between 16 and 22
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