When you ask "What number is halfway between 20 and 901?" 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=901.
To find the number halfway between 20 and 901, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 901 into our formula, we get:
(20 + 901)/2 = 460.5
Thus, the number halfway between 20 and 901 is 460.5.
To check that our answer is correct, we subtract 20 from 460.5 and subtract 460.5 from 901 and compare the two numbers:
460.5 - 20 = 440.5
901 - 460.5 = 440.5
As you can see, the halfway number is 440.5 higher than 20 and 440.5 lower than 901. Therefore, our halfway between answer of 460.5 above is correct.
Halfway Between
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