When you ask "What number is halfway between 21 and 486?" 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=486.
To find the number halfway between 21 and 486, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 486 into our formula, we get:
(21 + 486)/2 = 253.5
Thus, the number halfway between 21 and 486 is 253.5.
To check that our answer is correct, we subtract 21 from 253.5 and subtract 253.5 from 486 and compare the two numbers:
253.5 - 21 = 232.5
486 - 253.5 = 232.5
As you can see, the halfway number is 232.5 higher than 21 and 232.5 lower than 486. Therefore, our halfway between answer of 253.5 above is correct.
Halfway Between
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Halfway Between 21 and 487
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