When you ask "What number is halfway between 21 and 326?" 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=326.
To find the number halfway between 21 and 326, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 326 into our formula, we get:
(21 + 326)/2 = 173.5
Thus, the number halfway between 21 and 326 is 173.5.
To check that our answer is correct, we subtract 21 from 173.5 and subtract 173.5 from 326 and compare the two numbers:
173.5 - 21 = 152.5
326 - 173.5 = 152.5
As you can see, the halfway number is 152.5 higher than 21 and 152.5 lower than 326. Therefore, our halfway between answer of 173.5 above is correct.
Halfway Between
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Halfway Between 21 and 327
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