When you ask "What number is halfway between 21 and 590?" 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=590.
To find the number halfway between 21 and 590, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 590 into our formula, we get:
(21 + 590)/2 = 305.5
Thus, the number halfway between 21 and 590 is 305.5.
To check that our answer is correct, we subtract 21 from 305.5 and subtract 305.5 from 590 and compare the two numbers:
305.5 - 21 = 284.5
590 - 305.5 = 284.5
As you can see, the halfway number is 284.5 higher than 21 and 284.5 lower than 590. Therefore, our halfway between answer of 305.5 above is correct.
Halfway Between
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Halfway Between 21 and 591
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