When you ask "What number is halfway between 21 and 986?" 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=986.
To find the number halfway between 21 and 986, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 986 into our formula, we get:
(21 + 986)/2 = 503.5
Thus, the number halfway between 21 and 986 is 503.5.
To check that our answer is correct, we subtract 21 from 503.5 and subtract 503.5 from 986 and compare the two numbers:
503.5 - 21 = 482.5
986 - 503.5 = 482.5
As you can see, the halfway number is 482.5 higher than 21 and 482.5 lower than 986. Therefore, our halfway between answer of 503.5 above is correct.
Halfway Between
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Halfway Between 21 and 987
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