Answer: 9.8
Explanation:
The tenth is the first number afther the decimal point.
The rules for rounding are: If the number after (in this case the second number afther the decimal point)it is 5 or bigger, we round up (adding 1) if the number after it is less than 5, the we round down, and leave the number as it is:
The number that we have is 9.77
The first number afther the decimal place is a 7, and the number after it is aso a 7, so we need to round up to 8 ( 7 + 1 = 8)
Then the rounded number is
9.8