When you ask "What number is halfway between 28 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=28 and Y=845.
To find the number halfway between 28 and 845, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 28 and 845 into our formula, we get:
(28 + 845)/2 = 436.5
Thus, the number halfway between 28 and 845 is 436.5.
To check that our answer is correct, we subtract 28 from 436.5 and subtract 436.5 from 845 and compare the two numbers:
436.5 - 28 = 408.5
845 - 436.5 = 408.5
As you can see, the halfway number is 408.5 higher than 28 and 408.5 lower than 845. Therefore, our halfway between answer of 436.5 above is correct.
Halfway Between
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Halfway Between 28 and 846
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