Grade 7 | Unit 5 | Lesson 9: Multiplying Rational Numbers | Practice Problems

Fill in the missing numbers in these equations. Equation 1: $$-2 \times -4.5$$ , Equation 2: $$-8.7 \times -10$$ , Equation 3: $$-7 \times ?$$ , Equation 4: $$? \times 10$$

A weather station on the top of a mountain reports that the temperature is currently $$0^\circ C$$ and has been falling at a constant rate of $$3^\circ C$$ per hour. If it continues to fall at this rate, find each indicated temperature. What will the temperature be in 2 hours?

A weather station on the top of a mountain reports that the temperature is currently $$0^\circ C$$ and has been falling at a constant rate of $$3^\circ C$$ per hour. If it continues to fall at this rate, find each indicated temperature. What will the temperature be in 5 hours?

A weather station on the top of a mountain reports that the temperature is currently $$0^\circ C$$ and has been falling at a constant rate of $$3^\circ C$$ per hour. If it continues to fall at this rate, find each indicated temperature. What will the temperature be in half an hour?

A weather station on the top of a mountain reports that the temperature is currently $$0^\circ C$$ and has been falling at a constant rate of $$3^\circ C$$ per hour. If it continues to fall at this rate, find each indicated temperature. What was the temperature 1 hour ago?

A weather station on the top of a mountain reports that the temperature is currently $$0^\circ C$$ and has been falling at a constant rate of $$3^\circ C$$ per hour. If it continues to fall at this rate, find each indicated temperature. What was the temperature 3 hours ago?

A weather station on the top of a mountain reports that the temperature is currently $$0^\circ C$$ and has been falling at a constant rate of $$3^\circ C$$ per hour. If it continues to fall at this rate, find each indicated temperature. What was the temperature 4.5 hours ago?

Find the value of each expression: Expression 1: $$\frac{1}{4} \times -12$$ , Expression 2: $$-\frac{1}{3} \times 39$$ , Expression 3: $$-\frac{4}{5} \times -75$$ , Expression 4: $$-\frac{2}{5} \times -\frac{3}{4}$$ , Expression 5: $$\frac{8}{3} \times -42$$

To make a specific hair dye, a hair stylist uses a ratio of $$1\frac{1}{8}$$ oz of red tone, $$\frac{3}{4}$$ oz of gray tone, and $$\frac{5}{8}$$ oz of brown tone. If the stylist needs to make 20 oz of dye, how much of each dye color is needed?

To make a specific hair dye, a hair stylist uses a ratio of $$1\frac{1}{8}$$ oz of red tone, $$\frac{3}{4}$$ oz of gray tone, and $$\frac{5}{8}$$ oz of brown tone. If the stylist needs to make 100 oz of dye, how much of each dye color is needed?