When you ask "What number is halfway between 21 and 948?" 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=948.
To find the number halfway between 21 and 948, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 948 into our formula, we get:
(21 + 948)/2 = 484.5
Thus, the number halfway between 21 and 948 is 484.5.
To check that our answer is correct, we subtract 21 from 484.5 and subtract 484.5 from 948 and compare the two numbers:
484.5 - 21 = 463.5
948 - 484.5 = 463.5
As you can see, the halfway number is 463.5 higher than 21 and 463.5 lower than 948. Therefore, our halfway between answer of 484.5 above is correct.
Halfway Between
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Halfway Between 21 and 949
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