When you ask "What number is halfway between 17 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=17 and Y=487.
To find the number halfway between 17 and 487, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 17 and 487 into our formula, we get:
(17 + 487)/2 = 252
Thus, the number halfway between 17 and 487 is 252.
To check that our answer is correct, we subtract 17 from 252 and subtract 252 from 487 and compare the two numbers:
252 - 17 = 235
487 - 252 = 235
As you can see, the halfway number is 235 higher than 17 and 235 lower than 487. Therefore, our halfway between answer of 252 above is correct.
Halfway Between
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Halfway Between 17 and 488
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