Halfway Between 20 and 513

When you ask "What number is halfway between 20 and 513?" 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=513.

Halfway Between Line

To find the number halfway between 20 and 513, we use the following formula:

(X + Y)/2 = Halfway Between

When we enter 20 and 513 into our formula, we get:

(20 + 513)/2 = 266.5

Thus, the number halfway between 20 and 513 is 266.5.

To check that our answer is correct, we subtract 20 from 266.5 and subtract 266.5 from 513 and compare the two numbers:

266.5 - 20 = 246.5
513 - 266.5 = 246.5

As you can see, the halfway number is 246.5 higher than 20 and 246.5 lower than 513. Therefore, our halfway between answer of 266.5 above is correct.

Halfway Between
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Halfway Between 20 and 514
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