When you ask "What number is halfway between 12 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=12 and Y=513.
To find the number halfway between 12 and 513, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 513 into our formula, we get:
(12 + 513)/2 = 262.5
Thus, the number halfway between 12 and 513 is 262.5.
To check that our answer is correct, we subtract 12 from 262.5 and subtract 262.5 from 513 and compare the two numbers:
262.5 - 12 = 250.5
513 - 262.5 = 250.5
As you can see, the halfway number is 250.5 higher than 12 and 250.5 lower than 513. Therefore, our halfway between answer of 262.5 above is correct.
Halfway Between
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Halfway Between 12 and 514
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