When you ask "What number is halfway between 20 and 306?" 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=306.
To find the number halfway between 20 and 306, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 306 into our formula, we get:
(20 + 306)/2 = 163
Thus, the number halfway between 20 and 306 is 163.
To check that our answer is correct, we subtract 20 from 163 and subtract 163 from 306 and compare the two numbers:
163 - 20 = 143
306 - 163 = 143
As you can see, the halfway number is 143 higher than 20 and 143 lower than 306. Therefore, our halfway between answer of 163 above is correct.
Halfway Between
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Halfway Between 20 and 307
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