Ratios and Percents

Write the two ratios as a proportion.

Answer explanation

 

7:9 = 21:

Determine the scale factor that relates the two ratios.

Answer explanation

3

Calculate the missing term.

Answer explanation

27

21: 3 = _: 1

Answer explanation

3

5:3 = _: 9

Answer explanation

3

Answer explanation

7

simplify then answer

According to Ryan’s baseball statistics, he hits the ball 4 times for every 7 times he bats. If he bats 21 times during a baseball tournament, how many hits will he make if his statistics remain the same?

Answer explanation

12

Set up the proportion and then answer

In 3 days, it rained 180 mm. On average, how many millimetres did it rain each day?

• 45 mm per day

• 60 mm per day

• 90 mm per day

• 120 mm per day

Fifteen marbles cost $1.80. How much did each marble cost?

• $0.08 per marble

• $0.10 per marble

• $0.12 per marble

• $0.15 per marble

A hummingbird flaps its wings 960 times in 12 seconds. How many times does it flap its wings in 13 seconds?

• 1,040 times

• 1,120 times

• 1,080 times

• 1,200 times