When you ask "What number is halfway between 15 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=15 and Y=676.
To find the number halfway between 15 and 676, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 676 into our formula, we get:
(15 + 676)/2 = 345.5
Thus, the number halfway between 15 and 676 is 345.5.
To check that our answer is correct, we subtract 15 from 345.5 and subtract 345.5 from 676 and compare the two numbers:
345.5 - 15 = 330.5
676 - 345.5 = 330.5
As you can see, the halfway number is 330.5 higher than 15 and 330.5 lower than 676. Therefore, our halfway between answer of 345.5 above is correct.
Halfway Between
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Halfway Between 15 and 677
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