Mastering Proportions: Cross-Multiplication & Reasonableness

A recipe calls for 2 cups of flour for every 3 cups of sugar. If you want to use 8 cups of sugar, how many cups of flour do you need?

• 5.33 cups of flour

• 3 cups of flour

• 6 cups of flour

• 4 cups of flour

A car travels 150 miles on 5 gallons of gas. How many gallons of gas would it need to travel 300 miles?

• 15 gallons

• 10 gallons

• 20 gallons

• 5 gallons

If 4 apples cost $2, how much would 10 apples cost?

• $3.00

• $4.00

• $5.00

• $6.00

A map shows that 1 inch represents 20 miles. If two cities are 3 inches apart on the map, how far apart are they in real life?

• 40 miles

• 80 miles

• 100 miles

• 60 miles

A school has a ratio of 3 teachers for every 20 students. If there are 60 students, how many teachers are there?

• 15

• 12

• 9

• 6

If a recipe requires 5 eggs for 12 cookies, how many eggs are needed for 30 cookies?

• 10

• 13

• 8

• 15

A car can travel 240 miles on 8 gallons of gas. How far can it travel on 12 gallons?

• 360 miles

• 240 miles

• 480 miles

• 300 miles

If 5 pounds of potatoes cost $3, how much would 15 pounds cost?

• $9.00

• $15.00

• $12.00

• $6.00

A train travels 180 miles in 3 hours. How far will it travel in 5 hours at the same speed?

• 240 miles

• 360 miles

• 150 miles

• 300 miles

If 7 notebooks cost $14, how much would 10 notebooks cost?

• $25

• $20

• $30

• $15