When you ask "What number is halfway between 20 and 487?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=20 and Y=487.
To find the number halfway between 20 and 487, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 487 into our formula, we get:
(20 + 487)/2 = 253.5
Thus, the number halfway between 20 and 487 is 253.5.
To check that our answer is correct, we subtract 20 from 253.5 and subtract 253.5 from 487 and compare the two numbers:
253.5 - 20 = 233.5
487 - 253.5 = 233.5
As you can see, the halfway number is 233.5 higher than 20 and 233.5 lower than 487. Therefore, our halfway between answer of 253.5 above is correct.
Halfway Between
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Halfway Between 20 and 488
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