When you ask "What number is halfway between 21 and 354?" 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=354.
To find the number halfway between 21 and 354, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 354 into our formula, we get:
(21 + 354)/2 = 187.5
Thus, the number halfway between 21 and 354 is 187.5.
To check that our answer is correct, we subtract 21 from 187.5 and subtract 187.5 from 354 and compare the two numbers:
187.5 - 21 = 166.5
354 - 187.5 = 166.5
As you can see, the halfway number is 166.5 higher than 21 and 166.5 lower than 354. Therefore, our halfway between answer of 187.5 above is correct.
Halfway Between
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Halfway Between 21 and 355
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