When you ask "What number is halfway between 21 and 48?" 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=48.
To find the number halfway between 21 and 48, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 48 into our formula, we get:
(21 + 48)/2 = 34.5
Thus, the number halfway between 21 and 48 is 34.5.
To check that our answer is correct, we subtract 21 from 34.5 and subtract 34.5 from 48 and compare the two numbers:
34.5 - 21 = 13.5
48 - 34.5 = 13.5
As you can see, the halfway number is 13.5 higher than 21 and 13.5 lower than 48. Therefore, our halfway between answer of 34.5 above is correct.
Halfway Between
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Halfway Between 21 and 49
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