When you ask "What number is halfway between 20 and 307?" 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=307.
To find the number halfway between 20 and 307, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 307 into our formula, we get:
(20 + 307)/2 = 163.5
Thus, the number halfway between 20 and 307 is 163.5.
To check that our answer is correct, we subtract 20 from 163.5 and subtract 163.5 from 307 and compare the two numbers:
163.5 - 20 = 143.5
307 - 163.5 = 143.5
As you can see, the halfway number is 143.5 higher than 20 and 143.5 lower than 307. Therefore, our halfway between answer of 163.5 above is correct.
Halfway Between
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Halfway Between 20 and 308
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