When you ask "What number is halfway between 99 and 872?" 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=872.
To find the number halfway between 99 and 872, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 872 into our formula, we get:
(99 + 872)/2 = 485.5
Thus, the number halfway between 99 and 872 is 485.5.
To check that our answer is correct, we subtract 99 from 485.5 and subtract 485.5 from 872 and compare the two numbers:
485.5 - 99 = 386.5
872 - 485.5 = 386.5
As you can see, the halfway number is 386.5 higher than 99 and 386.5 lower than 872. Therefore, our halfway between answer of 485.5 above is correct.
Halfway Between
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Halfway Between 99 and 873
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