Cross Multiplication: Reasonableness & Unit Conversions

A recipe calls for 3 cups of flour for every 2 cups of sugar. If you want to use 5 cups of sugar, how many cups of flour do you need? Check if your answer is reasonable.

• 5 cups of flour

• 10 cups of flour

• 2 cups of flour

• 7.5 cups of flour

A car travels 150 miles on 5 gallons of gas. How many miles can it travel on 8 gallons of gas? Convert your answer to kilometers (1 mile = 1.60934 km) and check for reasonableness.

• 386.243 km

• 250.5 km

• 320.2 km

• 450.5 km

If 4 notebooks cost $12, how much would 10 notebooks cost? Verify if your answer makes sense based on the cost per notebook.

• $24

• $30

• $36

• $15

A map shows that 2 inches represent 50 miles. How many miles does 5 inches represent? Check if your answer is reasonable by estimating.

• 150 miles

• 75 miles

• 100 miles

• 125 miles

A recipe requires 1.5 liters of water for every 3 kilograms of rice. How much water is needed for 10 kilograms of rice? Convert your answer to milliliters and check for reasonableness.

• 3000 milliliters

• 5000 milliliters

• 7500 milliliters

• 10000 milliliters

If a car can travel 300 miles on 10 gallons of gas, how many gallons are needed to travel 450 miles? Check if your answer is reasonable by estimating the gallons needed per mile.

• 10 gallons

• 20 gallons

• 12 gallons

• 15 gallons

A painter can cover 120 square feet with 1 gallon of paint. How many gallons are needed to cover 300 square feet? Check if your answer is reasonable by estimating the area covered per gallon.

• 1 gallon

• 3 gallons

• 4 gallons

• 2.5 gallons

If 6 apples cost $3, how much would 15 apples cost? Verify if your answer is reasonable based on the cost per apple.

• $10.00

• $5.00

• $12.50

• $7.50

A recipe uses 2 tablespoons of oil for every 4 servings. How much oil is needed for 10 servings? Check if your answer is reasonable by estimating the amount needed per serving.

• 8 tablespoons

• 5 tablespoons

• 3 tablespoons

• 2 tablespoons

A car travels 180 miles in 3 hours. How far can it travel in 5 hours at the same speed? Convert your answer to kilometers and check for reasonableness.

• 400 kilometers

• 300 kilometers

• 482.803 kilometers

• 450 kilometers