When you ask "What number is halfway between 20 and 321?" 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=321.
To find the number halfway between 20 and 321, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 321 into our formula, we get:
(20 + 321)/2 = 170.5
Thus, the number halfway between 20 and 321 is 170.5.
To check that our answer is correct, we subtract 20 from 170.5 and subtract 170.5 from 321 and compare the two numbers:
170.5 - 20 = 150.5
321 - 170.5 = 150.5
As you can see, the halfway number is 150.5 higher than 20 and 150.5 lower than 321. Therefore, our halfway between answer of 170.5 above is correct.
Halfway Between
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Halfway Between 20 and 322
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