When you ask "What number is halfway between 20 and 645?" 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=645.
To find the number halfway between 20 and 645, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 645 into our formula, we get:
(20 + 645)/2 = 332.5
Thus, the number halfway between 20 and 645 is 332.5.
To check that our answer is correct, we subtract 20 from 332.5 and subtract 332.5 from 645 and compare the two numbers:
332.5 - 20 = 312.5
645 - 332.5 = 312.5
As you can see, the halfway number is 312.5 higher than 20 and 312.5 lower than 645. Therefore, our halfway between answer of 332.5 above is correct.
Halfway Between
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Halfway Between 20 and 646
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