When you ask "What number is halfway between 21 and 384?" 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=384.
To find the number halfway between 21 and 384, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 384 into our formula, we get:
(21 + 384)/2 = 202.5
Thus, the number halfway between 21 and 384 is 202.5.
To check that our answer is correct, we subtract 21 from 202.5 and subtract 202.5 from 384 and compare the two numbers:
202.5 - 21 = 181.5
384 - 202.5 = 181.5
As you can see, the halfway number is 181.5 higher than 21 and 181.5 lower than 384. Therefore, our halfway between answer of 202.5 above is correct.
Halfway Between
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Halfway Between 21 and 385
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