When you ask "What number is halfway between 21 and 548?" 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=548.
To find the number halfway between 21 and 548, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 548 into our formula, we get:
(21 + 548)/2 = 284.5
Thus, the number halfway between 21 and 548 is 284.5.
To check that our answer is correct, we subtract 21 from 284.5 and subtract 284.5 from 548 and compare the two numbers:
284.5 - 21 = 263.5
548 - 284.5 = 263.5
As you can see, the halfway number is 263.5 higher than 21 and 263.5 lower than 548. Therefore, our halfway between answer of 284.5 above is correct.
Halfway Between
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Halfway Between 21 and 549
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