Quiz

Grade 8: Ratio and proportion

10 questions with solutions for grade 8: ratio, proportion, direct and inverse proportion.

Type the number or choose the right answer. When you finish, click Check answers and see the solutions.

1. Simplify the ratio 1.5 ÷ 2.5.

A. 15 ÷ 2

B. 3 ÷ 5

C. 1 ÷ 2

D. 5 ÷ 3

2. Solve the proportion x : 6 = 10 ÷ 15.Enter a number only

3. Share 840 in the ratio 2 ÷ 5. What is the larger part?Enter a number only

4. 8 notebooks cost 360 denars. How much do 12 cost?Enter a number only

5. 6 workers finish a job in 15 days. How many days do 9 workers take?Enter a number only

6. At 80 km/h the trip takes 3 hours. How many hours at 120 km/h?Enter a number only

7. Which quantities are inversely proportional?

A. number of notebooks and cost

B. a square’s side and perimeter

C. mass and cost of apples

D. speed and time for the same distance

8. y = kx. If y = 21 when x = 7, what is k?Enter a number only

9. 10 biscuits need 250 g of flour. How many grams for 30 biscuits?Enter a number only

10. On a 1 ÷ 50 000 map the distance is 6 cm. How many km is that?Enter a number only