12,848
When rounding 21.45 to the nearest whole number, you look at the digit in the tenths place, which is 4. Since 4 is less than 5, you round down. Therefore, 21.45 rounded to the nearest whole number is 21.
8
503.8 rounded to the nearest whole number is 504
17
5
33
40
3
76
75
178
1