What is 5.3 rounded to the nearest whole number?

When rounding a decimal number to the nearest whole number, you look at the first decimal place. If it is 5 or greater, you round up; if it is less than 5, you round down. In this case, 5.3 has a tenths place value of 3, which is less than 5. Therefore, when rounding 5.3 to the nearest whole number, it becomes 5.