When you ask "What number is halfway between 21 and 676?" 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=676.
To find the number halfway between 21 and 676, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 676 into our formula, we get:
(21 + 676)/2 = 348.5
Thus, the number halfway between 21 and 676 is 348.5.
To check that our answer is correct, we subtract 21 from 348.5 and subtract 348.5 from 676 and compare the two numbers:
348.5 - 21 = 327.5
676 - 348.5 = 327.5
As you can see, the halfway number is 327.5 higher than 21 and 327.5 lower than 676. Therefore, our halfway between answer of 348.5 above is correct.
Halfway Between
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Halfway Between 21 and 677
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