When you ask "What number is halfway between 99 and 742?" 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=742.
To find the number halfway between 99 and 742, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 742 into our formula, we get:
(99 + 742)/2 = 420.5
Thus, the number halfway between 99 and 742 is 420.5.
To check that our answer is correct, we subtract 99 from 420.5 and subtract 420.5 from 742 and compare the two numbers:
420.5 - 99 = 321.5
742 - 420.5 = 321.5
As you can see, the halfway number is 321.5 higher than 99 and 321.5 lower than 742. Therefore, our halfway between answer of 420.5 above is correct.
Halfway Between
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