When you ask "What number is halfway between 86 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=86 and Y=513.
To find the number halfway between 86 and 513, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 86 and 513 into our formula, we get:
(86 + 513)/2 = 299.5
Thus, the number halfway between 86 and 513 is 299.5.
To check that our answer is correct, we subtract 86 from 299.5 and subtract 299.5 from 513 and compare the two numbers:
299.5 - 86 = 213.5
513 - 299.5 = 213.5
As you can see, the halfway number is 213.5 higher than 86 and 213.5 lower than 513. Therefore, our halfway between answer of 299.5 above is correct.
Halfway Between
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Halfway Between 86 and 514
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