When you ask "What number is halfway between 21 and 599?" 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=599.
To find the number halfway between 21 and 599, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 599 into our formula, we get:
(21 + 599)/2 = 310
Thus, the number halfway between 21 and 599 is 310.
To check that our answer is correct, we subtract 21 from 310 and subtract 310 from 599 and compare the two numbers:
310 - 21 = 289
599 - 310 = 289
As you can see, the halfway number is 289 higher than 21 and 289 lower than 599. Therefore, our halfway between answer of 310 above is correct.
Halfway Between
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Halfway Between 21 and 600
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