504 rounded to nearest tens is 500
504+310
1.3
10
500
500
500
There are infinitely many numbers in the range [495, 505].
500
60
500
Anything from 495 to 504
503.8, when rounded to the nearest whole number, is 504.
500
500
500
2
There are infinitely many numbers in the range [495, 505].
500
60
It is then 740 when rounded to the nearest ten.
30