Ratios, Decimals, and Percentages

Compare:

6.1 ______ 6.100

At the local zoo, there were 3 reptiles for every 7 mammals. How many mammals were there if there were 90 reptiles?

Karl opened a library. 1/5 of the books are history books, while the rest are non-history books. What percentage of the books are non-history?

Bill got 90% on a test that included 10 questions. How many questions did he get correct, assuming that each question had the same number of marks?

1/8 expressed as a percentage is:

The ratio of left-handed students to right-handed students in a class is 2:8. How many students are in the class, if there are 6 left handed students?

Olivia wants to buy 20 pounds of rice. She finds two options and wonders which option will save her more money. They are in 10-pound bags and 2-pound bags.

10-pound bag = $6
2-pound bag = $2

Which option is better for Olivia?

A car travels at 70 km/hr. How many hours will it take the car to travel 280 kilometers?

0.24 x 100 = ____________.

The ratio of girls to boys in a class is 5:6. How many girls are there if there are 33 students in the class altogether?