When you ask "What number is halfway between 20 and 671?" 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=671.
To find the number halfway between 20 and 671, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 671 into our formula, we get:
(20 + 671)/2 = 345.5
Thus, the number halfway between 20 and 671 is 345.5.
To check that our answer is correct, we subtract 20 from 345.5 and subtract 345.5 from 671 and compare the two numbers:
345.5 - 20 = 325.5
671 - 345.5 = 325.5
As you can see, the halfway number is 325.5 higher than 20 and 325.5 lower than 671. Therefore, our halfway between answer of 345.5 above is correct.
Halfway Between
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Halfway Between 20 and 672
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