When you ask "What number is halfway between 20 and 867?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=20 and Y=867.
To find the number halfway between 20 and 867, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 867 into our formula, we get:
(20 + 867)/2 = 443.5
Thus, the number halfway between 20 and 867 is 443.5.
To check that our answer is correct, we subtract 20 from 443.5 and subtract 443.5 from 867 and compare the two numbers:
443.5 - 20 = 423.5
867 - 443.5 = 423.5
As you can see, the halfway number is 423.5 higher than 20 and 423.5 lower than 867. Therefore, our halfway between answer of 443.5 above is correct.
Halfway Between
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Halfway Between 20 and 868
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