When you ask "What number is halfway between 21 and 320?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=21 and Y=320.
To find the number halfway between 21 and 320, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 320 into our formula, we get:
(21 + 320)/2 = 170.5
Thus, the number halfway between 21 and 320 is 170.5.
To check that our answer is correct, we subtract 21 from 170.5 and subtract 170.5 from 320 and compare the two numbers:
170.5 - 21 = 149.5
320 - 170.5 = 149.5
As you can see, the halfway number is 149.5 higher than 21 and 149.5 lower than 320. Therefore, our halfway between answer of 170.5 above is correct.
Halfway Between
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Halfway Between 21 and 321
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