When you ask "What number is halfway between 21 and 442?" 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=442.
To find the number halfway between 21 and 442, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 442 into our formula, we get:
(21 + 442)/2 = 231.5
Thus, the number halfway between 21 and 442 is 231.5.
To check that our answer is correct, we subtract 21 from 231.5 and subtract 231.5 from 442 and compare the two numbers:
231.5 - 21 = 210.5
442 - 231.5 = 210.5
As you can see, the halfway number is 210.5 higher than 21 and 210.5 lower than 442. Therefore, our halfway between answer of 231.5 above is correct.
Halfway Between
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Halfway Between 21 and 443
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