When you ask "What number is halfway between 21 and 988?" 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=988.
To find the number halfway between 21 and 988, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 988 into our formula, we get:
(21 + 988)/2 = 504.5
Thus, the number halfway between 21 and 988 is 504.5.
To check that our answer is correct, we subtract 21 from 504.5 and subtract 504.5 from 988 and compare the two numbers:
504.5 - 21 = 483.5
988 - 504.5 = 483.5
As you can see, the halfway number is 483.5 higher than 21 and 483.5 lower than 988. Therefore, our halfway between answer of 504.5 above is correct.
Halfway Between
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Halfway Between 21 and 989
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