
When you ask "What number is halfway between 21 and 392?" 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=392.

To find the number halfway between 21 and 392, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 392 into our formula, we get:
(21 + 392)/2 = 206.5
Thus, the number halfway between 21 and 392 is 206.5.
To check that our answer is correct, we subtract 21 from 206.5 and subtract 206.5 from 392 and compare the two numbers:
206.5 - 21 = 185.5
392 - 206.5 = 185.5
As you can see, the halfway number is 185.5 higher than 21 and 185.5 lower than 392. Therefore, our halfway between answer of 206.5 above is correct.
Halfway Between
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Halfway Between 21 and 393
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