When you ask "What number is halfway between 21 and 474?" 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=474.
To find the number halfway between 21 and 474, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 474 into our formula, we get:
(21 + 474)/2 = 247.5
Thus, the number halfway between 21 and 474 is 247.5.
To check that our answer is correct, we subtract 21 from 247.5 and subtract 247.5 from 474 and compare the two numbers:
247.5 - 21 = 226.5
474 - 247.5 = 226.5
As you can see, the halfway number is 226.5 higher than 21 and 226.5 lower than 474. Therefore, our halfway between answer of 247.5 above is correct.
Halfway Between
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Halfway Between 21 and 475
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