When you ask "What number is halfway between 21 and 386?" 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=386.
To find the number halfway between 21 and 386, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 386 into our formula, we get:
(21 + 386)/2 = 203.5
Thus, the number halfway between 21 and 386 is 203.5.
To check that our answer is correct, we subtract 21 from 203.5 and subtract 203.5 from 386 and compare the two numbers:
203.5 - 21 = 182.5
386 - 203.5 = 182.5
As you can see, the halfway number is 182.5 higher than 21 and 182.5 lower than 386. Therefore, our halfway between answer of 203.5 above is correct.
Halfway Between
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Halfway Between 21 and 387
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