When you ask "What number is halfway between 42 and 517?" 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=517.
To find the number halfway between 42 and 517, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 517 into our formula, we get:
(42 + 517)/2 = 279.5
Thus, the number halfway between 42 and 517 is 279.5.
To check that our answer is correct, we subtract 42 from 279.5 and subtract 279.5 from 517 and compare the two numbers:
279.5 - 42 = 237.5
517 - 279.5 = 237.5
As you can see, the halfway number is 237.5 higher than 42 and 237.5 lower than 517. Therefore, our halfway between answer of 279.5 above is correct.
Halfway Between
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Halfway Between 42 and 518
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