When you ask "What number is halfway between 4 and 921?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=4 and Y=921.
To find the number halfway between 4 and 921, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 4 and 921 into our formula, we get:
(4 + 921)/2 = 462.5
Thus, the number halfway between 4 and 921 is 462.5.
To check that our answer is correct, we subtract 4 from 462.5 and subtract 462.5 from 921 and compare the two numbers:
462.5 - 4 = 458.5
921 - 462.5 = 458.5
As you can see, the halfway number is 458.5 higher than 4 and 458.5 lower than 921. Therefore, our halfway between answer of 462.5 above is correct.
Halfway Between
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Halfway Between 4 and 922
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