When you ask "What number is halfway between 11 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=11 and Y=487.
To find the number halfway between 11 and 487, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 11 and 487 into our formula, we get:
(11 + 487)/2 = 249
Thus, the number halfway between 11 and 487 is 249.
To check that our answer is correct, we subtract 11 from 249 and subtract 249 from 487 and compare the two numbers:
249 - 11 = 238
487 - 249 = 238
As you can see, the halfway number is 238 higher than 11 and 238 lower than 487. Therefore, our halfway between answer of 249 above is correct.
Halfway Between
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Halfway Between 11 and 488
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