When you ask "What number is halfway between 21 and 547?" 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=547.
To find the number halfway between 21 and 547, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 547 into our formula, we get:
(21 + 547)/2 = 284
Thus, the number halfway between 21 and 547 is 284.
To check that our answer is correct, we subtract 21 from 284 and subtract 284 from 547 and compare the two numbers:
284 - 21 = 263
547 - 284 = 263
As you can see, the halfway number is 263 higher than 21 and 263 lower than 547. Therefore, our halfway between answer of 284 above is correct.
Halfway Between
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Halfway Between 21 and 548
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