When you ask "What number is halfway between 21 and 322?" 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=322.
To find the number halfway between 21 and 322, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 322 into our formula, we get:
(21 + 322)/2 = 171.5
Thus, the number halfway between 21 and 322 is 171.5.
To check that our answer is correct, we subtract 21 from 171.5 and subtract 171.5 from 322 and compare the two numbers:
171.5 - 21 = 150.5
322 - 171.5 = 150.5
As you can see, the halfway number is 150.5 higher than 21 and 150.5 lower than 322. Therefore, our halfway between answer of 171.5 above is correct.
Halfway Between
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Halfway Between 21 and 323
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