When you ask "What number is halfway between 99 and 870?" 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=870.
To find the number halfway between 99 and 870, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 870 into our formula, we get:
(99 + 870)/2 = 484.5
Thus, the number halfway between 99 and 870 is 484.5.
To check that our answer is correct, we subtract 99 from 484.5 and subtract 484.5 from 870 and compare the two numbers:
484.5 - 99 = 385.5
870 - 484.5 = 385.5
As you can see, the halfway number is 385.5 higher than 99 and 385.5 lower than 870. Therefore, our halfway between answer of 484.5 above is correct.
Halfway Between
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Halfway Between 99 and 871
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