When you ask "What number is halfway between 20 and 729?" 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=729.
To find the number halfway between 20 and 729, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 729 into our formula, we get:
(20 + 729)/2 = 374.5
Thus, the number halfway between 20 and 729 is 374.5.
To check that our answer is correct, we subtract 20 from 374.5 and subtract 374.5 from 729 and compare the two numbers:
374.5 - 20 = 354.5
729 - 374.5 = 354.5
As you can see, the halfway number is 354.5 higher than 20 and 354.5 lower than 729. Therefore, our halfway between answer of 374.5 above is correct.
Halfway Between
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Halfway Between 20 and 730
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