When you ask "What number is halfway between 99 and 842?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=99 and Y=842.
To find the number halfway between 99 and 842, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 842 into our formula, we get:
(99 + 842)/2 = 470.5
Thus, the number halfway between 99 and 842 is 470.5.
To check that our answer is correct, we subtract 99 from 470.5 and subtract 470.5 from 842 and compare the two numbers:
470.5 - 99 = 371.5
842 - 470.5 = 371.5
As you can see, the halfway number is 371.5 higher than 99 and 371.5 lower than 842. Therefore, our halfway between answer of 470.5 above is correct.
Halfway Between
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Halfway Between 99 and 843
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