When you ask "What number is halfway between 15 and 770?" 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=770.
To find the number halfway between 15 and 770, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 770 into our formula, we get:
(15 + 770)/2 = 392.5
Thus, the number halfway between 15 and 770 is 392.5.
To check that our answer is correct, we subtract 15 from 392.5 and subtract 392.5 from 770 and compare the two numbers:
392.5 - 15 = 377.5
770 - 392.5 = 377.5
As you can see, the halfway number is 377.5 higher than 15 and 377.5 lower than 770. Therefore, our halfway between answer of 392.5 above is correct.
Halfway Between
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Halfway Between 15 and 771
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