When you ask "What number is halfway between 9 and 998?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=9 and Y=998.
To find the number halfway between 9 and 998, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 998 into our formula, we get:
(9 + 998)/2 = 503.5
Thus, the number halfway between 9 and 998 is 503.5.
To check that our answer is correct, we subtract 9 from 503.5 and subtract 503.5 from 998 and compare the two numbers:
503.5 - 9 = 494.5
998 - 503.5 = 494.5
As you can see, the halfway number is 494.5 higher than 9 and 494.5 lower than 998. Therefore, our halfway between answer of 503.5 above is correct.
Halfway Between
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Halfway Between 9 and 999
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