When you ask "What number is halfway between 21 and 850?" 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=850.
To find the number halfway between 21 and 850, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 850 into our formula, we get:
(21 + 850)/2 = 435.5
Thus, the number halfway between 21 and 850 is 435.5.
To check that our answer is correct, we subtract 21 from 435.5 and subtract 435.5 from 850 and compare the two numbers:
435.5 - 21 = 414.5
850 - 435.5 = 414.5
As you can see, the halfway number is 414.5 higher than 21 and 414.5 lower than 850. Therefore, our halfway between answer of 435.5 above is correct.
Halfway Between
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Halfway Between 21 and 851
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