When you ask "What number is halfway between 15 and 670?" 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=670.
To find the number halfway between 15 and 670, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 670 into our formula, we get:
(15 + 670)/2 = 342.5
Thus, the number halfway between 15 and 670 is 342.5.
To check that our answer is correct, we subtract 15 from 342.5 and subtract 342.5 from 670 and compare the two numbers:
342.5 - 15 = 327.5
670 - 342.5 = 327.5
As you can see, the halfway number is 327.5 higher than 15 and 327.5 lower than 670. Therefore, our halfway between answer of 342.5 above is correct.
Halfway Between
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Halfway Between 15 and 671
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