When you ask "What number is halfway between 21 and 383?" 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=383.
To find the number halfway between 21 and 383, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 383 into our formula, we get:
(21 + 383)/2 = 202
Thus, the number halfway between 21 and 383 is 202.
To check that our answer is correct, we subtract 21 from 202 and subtract 202 from 383 and compare the two numbers:
202 - 21 = 181
383 - 202 = 181
As you can see, the halfway number is 181 higher than 21 and 181 lower than 383. Therefore, our halfway between answer of 202 above is correct.
Halfway Between
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Halfway Between 21 and 384
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