When you ask "What number is halfway between 21 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=21 and Y=542.
To find the number halfway between 21 and 542, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 542 into our formula, we get:
(21 + 542)/2 = 281.5
Thus, the number halfway between 21 and 542 is 281.5.
To check that our answer is correct, we subtract 21 from 281.5 and subtract 281.5 from 542 and compare the two numbers:
281.5 - 21 = 260.5
542 - 281.5 = 260.5
As you can see, the halfway number is 260.5 higher than 21 and 260.5 lower than 542. Therefore, our halfway between answer of 281.5 above is correct.
Halfway Between
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Halfway Between 21 and 543
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