When you ask "What number is halfway between 15 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=15 and Y=542.
To find the number halfway between 15 and 542, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 542 into our formula, we get:
(15 + 542)/2 = 278.5
Thus, the number halfway between 15 and 542 is 278.5.
To check that our answer is correct, we subtract 15 from 278.5 and subtract 278.5 from 542 and compare the two numbers:
278.5 - 15 = 263.5
542 - 278.5 = 263.5
As you can see, the halfway number is 263.5 higher than 15 and 263.5 lower than 542. Therefore, our halfway between answer of 278.5 above is correct.
Halfway Between
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Halfway Between 15 and 543
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