When you ask "What number is halfway between 21 and 678?" 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=678.
To find the number halfway between 21 and 678, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 678 into our formula, we get:
(21 + 678)/2 = 349.5
Thus, the number halfway between 21 and 678 is 349.5.
To check that our answer is correct, we subtract 21 from 349.5 and subtract 349.5 from 678 and compare the two numbers:
349.5 - 21 = 328.5
678 - 349.5 = 328.5
As you can see, the halfway number is 328.5 higher than 21 and 328.5 lower than 678. Therefore, our halfway between answer of 349.5 above is correct.
Halfway Between
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Halfway Between 21 and 679
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