When you ask "What number is halfway between 4 and 845?" 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=845.
To find the number halfway between 4 and 845, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 4 and 845 into our formula, we get:
(4 + 845)/2 = 424.5
Thus, the number halfway between 4 and 845 is 424.5.
To check that our answer is correct, we subtract 4 from 424.5 and subtract 424.5 from 845 and compare the two numbers:
424.5 - 4 = 420.5
845 - 424.5 = 420.5
As you can see, the halfway number is 420.5 higher than 4 and 420.5 lower than 845. Therefore, our halfway between answer of 424.5 above is correct.
Halfway Between
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Halfway Between 4 and 846
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