When you ask "What number is halfway between 21 and 382?" 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=382.
To find the number halfway between 21 and 382, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 382 into our formula, we get:
(21 + 382)/2 = 201.5
Thus, the number halfway between 21 and 382 is 201.5.
To check that our answer is correct, we subtract 21 from 201.5 and subtract 201.5 from 382 and compare the two numbers:
201.5 - 21 = 180.5
382 - 201.5 = 180.5
As you can see, the halfway number is 180.5 higher than 21 and 180.5 lower than 382. Therefore, our halfway between answer of 201.5 above is correct.
Halfway Between
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Halfway Between 21 and 383
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