When you ask "What number is halfway between 21 and 546?" 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=546.
To find the number halfway between 21 and 546, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 546 into our formula, we get:
(21 + 546)/2 = 283.5
Thus, the number halfway between 21 and 546 is 283.5.
To check that our answer is correct, we subtract 21 from 283.5 and subtract 283.5 from 546 and compare the two numbers:
283.5 - 21 = 262.5
546 - 283.5 = 262.5
As you can see, the halfway number is 262.5 higher than 21 and 262.5 lower than 546. Therefore, our halfway between answer of 283.5 above is correct.
Halfway Between
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Halfway Between 21 and 547
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