When you ask "What number is halfway between 21 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=21 and Y=998.
To find the number halfway between 21 and 998, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 998 into our formula, we get:
(21 + 998)/2 = 509.5
Thus, the number halfway between 21 and 998 is 509.5.
To check that our answer is correct, we subtract 21 from 509.5 and subtract 509.5 from 998 and compare the two numbers:
509.5 - 21 = 488.5
998 - 509.5 = 488.5
As you can see, the halfway number is 488.5 higher than 21 and 488.5 lower than 998. Therefore, our halfway between answer of 509.5 above is correct.
Halfway Between
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Halfway Between 21 and 999
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