30
The number after 9 is 8 which is greater than 5, so 1 is added to 29 which makes it 30.
8
503.8 rounded to the nearest whole number is 504
17
1
178
It is 3 when rounded to the nearest whole number
It is 5 rounded to the nearest whole number
It is 1 when rounded to the nearest whole number
12
It is 16 when rounded to the nearest whole number
It is 1 rounded to the nearest whole number
It is 63 rounded to the nearest whole number