When you ask "What number is halfway between 20 and 303?" 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=303.
To find the number halfway between 20 and 303, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 303 into our formula, we get:
(20 + 303)/2 = 161.5
Thus, the number halfway between 20 and 303 is 161.5.
To check that our answer is correct, we subtract 20 from 161.5 and subtract 161.5 from 303 and compare the two numbers:
161.5 - 20 = 141.5
303 - 161.5 = 141.5
As you can see, the halfway number is 141.5 higher than 20 and 141.5 lower than 303. Therefore, our halfway between answer of 161.5 above is correct.
Halfway Between
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Halfway Between 20 and 304
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