When you ask "What number is halfway between 21 and 554?" 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=554.
To find the number halfway between 21 and 554, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 554 into our formula, we get:
(21 + 554)/2 = 287.5
Thus, the number halfway between 21 and 554 is 287.5.
To check that our answer is correct, we subtract 21 from 287.5 and subtract 287.5 from 554 and compare the two numbers:
287.5 - 21 = 266.5
554 - 287.5 = 266.5
As you can see, the halfway number is 266.5 higher than 21 and 266.5 lower than 554. Therefore, our halfway between answer of 287.5 above is correct.
Halfway Between
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Halfway Between 21 and 555
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