When you ask "What number is halfway between 21 and 924?" 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=924.
To find the number halfway between 21 and 924, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 924 into our formula, we get:
(21 + 924)/2 = 472.5
Thus, the number halfway between 21 and 924 is 472.5.
To check that our answer is correct, we subtract 21 from 472.5 and subtract 472.5 from 924 and compare the two numbers:
472.5 - 21 = 451.5
924 - 472.5 = 451.5
As you can see, the halfway number is 451.5 higher than 21 and 451.5 lower than 924. Therefore, our halfway between answer of 472.5 above is correct.
Halfway Between
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Halfway Between 21 and 925
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