When you ask "What number is halfway between 20 and 515?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=20 and Y=515.
To find the number halfway between 20 and 515, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 515 into our formula, we get:
(20 + 515)/2 = 267.5
Thus, the number halfway between 20 and 515 is 267.5.
To check that our answer is correct, we subtract 20 from 267.5 and subtract 267.5 from 515 and compare the two numbers:
267.5 - 20 = 247.5
515 - 267.5 = 247.5
As you can see, the halfway number is 247.5 higher than 20 and 247.5 lower than 515. Therefore, our halfway between answer of 267.5 above is correct.
Halfway Between
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Halfway Between 20 and 516
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