When you ask "What number is halfway between 15 and 520?" 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=520.
To find the number halfway between 15 and 520, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 520 into our formula, we get:
(15 + 520)/2 = 267.5
Thus, the number halfway between 15 and 520 is 267.5.
To check that our answer is correct, we subtract 15 from 267.5 and subtract 267.5 from 520 and compare the two numbers:
267.5 - 15 = 252.5
520 - 267.5 = 252.5
As you can see, the halfway number is 252.5 higher than 15 and 252.5 lower than 520. Therefore, our halfway between answer of 267.5 above is correct.
Halfway Between
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Halfway Between 15 and 521
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