When you ask "What number is halfway between 42 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=42 and Y=513.
To find the number halfway between 42 and 513, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 513 into our formula, we get:
(42 + 513)/2 = 277.5
Thus, the number halfway between 42 and 513 is 277.5.
To check that our answer is correct, we subtract 42 from 277.5 and subtract 277.5 from 513 and compare the two numbers:
277.5 - 42 = 235.5
513 - 277.5 = 235.5
As you can see, the halfway number is 235.5 higher than 42 and 235.5 lower than 513. Therefore, our halfway between answer of 277.5 above is correct.
Halfway Between
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Halfway Between 42 and 514
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