Understanding Direct Proportion

What is direct proportion?

• Direct proportion means one quantity remains constant while the other changes.

• Direct proportion occurs only when one quantity is negative.

• Direct proportion is when two quantities are unrelated to each other.

• Direct proportion is a relationship where two quantities increase or decrease at the same rate.

If 3 apples cost $6, how much do 5 apples cost?

• $15

• $12

• $10

• $8

Identify whether the following are in direct proportion: (2, 4) and (3, 6)

• No

• Both pairs are not proportional

• Yes

• Only the first pair is proportional

If y is directly proportional to x, and y = 10 when x = 2, what is y when x = 5?

• 15

• 20

• 30

• 25

A car travels 60 miles in 1 hour. How far will it travel in 3 hours?

• 90 miles

• 240 miles

• 120 miles

• 180 miles

If the cost of 4 notebooks is $8, what is the cost of 10 notebooks?

• $25

• $20

• $12

• $15

Determine if the following sets of numbers are in direct proportion: (1, 2), (2, 4), (3, 6)

• Yes, the sets are in direct proportion.

• Only (1, 2) and (2, 4) are in direct proportion.

• No, the sets are not in direct proportion.

• The sets are in inverse proportion.

If a recipe requires 2 cups of flour for 4 servings, how much flour is needed for 10 servings?

• 3 cups of flour

• 4 cups of flour

• 5 cups of flour

• 6 cups of flour

A worker earns $15 for 3 hours of work. How much will he earn for 8 hours?

• $40

• $50

• $20

• $30

If the distance is directly proportional to time, and a train travels 120 miles in 2 hours, how far will it travel in 5 hours?

• 300 miles

• 240 miles

• 180 miles

• 150 miles