When you ask "What number is halfway between 17 and 542?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=17 and Y=542.
To find the number halfway between 17 and 542, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 17 and 542 into our formula, we get:
(17 + 542)/2 = 279.5
Thus, the number halfway between 17 and 542 is 279.5.
To check that our answer is correct, we subtract 17 from 279.5 and subtract 279.5 from 542 and compare the two numbers:
279.5 - 17 = 262.5
542 - 279.5 = 262.5
As you can see, the halfway number is 262.5 higher than 17 and 262.5 lower than 542. Therefore, our halfway between answer of 279.5 above is correct.
Halfway Between
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Halfway Between 17 and 543
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