Lesson 09: Multiplying Rational Numbers | Unit 5: Rational Number Arithmetic

Multiple Choice

Complete the equation with the number that makes it true. $$-2*(-4.5)=?$$

• 9
• 2
• -9
• -4.5

Multiple Choice

Complete the equation with the number that makes it true. $$(-8.7)\cdot(-10)\ =\ ?$$

• 10
• -87
• -80
• 87

Multiple Choice

Complete the equation with the number that makes it true. $$-7\cdot?=14$$

• -3
• 0
• 7
• -2

Multiple Choice

Complete the equation with the number that makes it true. $$?\cdot(-10)=90$$

• -9
• 9
• -10
• -8

Open Ended

A weather station on the top of a mountain reports that the temperature is currently $$0^\circ\text{C}$$ and has been falling at a constant rate of $$3^\circ\text{C}$$ per hour. If it continues to fall at this rate, what will the temperature be in 2 hours? Explain or show your reasoning.

Open Ended

A weather station on the top of a mountain reports that the temperature is currently $$0^\circ\text{C}$$ and has been falling at a constant rate of $$3^\circ\text{C}$$ per hour. If it continues to fall at this rate, what will the temperature be in 5 hours? Explain or show your reasoning.

Open Ended

A weather station on the top of a mountain reports that the temperature is currently $$0^\circ\text{C}$$ and has been falling at a constant rate of $$3^\circ\text{C}$$ per hour. If it continues to fall at this rate, what will the temperature be in $$\frac12$$ hour? Explain or show your reasoning.

Open Ended

A weather station on the top of a mountain reports that the temperature is currently 0°C and has been falling at a constant rate of 3°C per hour. If it continues to fall at this rate, what was the temperature 1 hour ago? Explain or show your reasoning.

Open Ended

A weather station on the top of a mountain reports that the temperature is currently $$0^\circ\text{C}$$ and has been falling at a constant rate of $$3^\circ\text{C}$$ per hour. If it continues to fall at this rate, what was the temperature 3 hours ago? Explain or show your reasoning.

Open Ended

A weather station on the top of a mountain reports that the temperature is currently $$0^\circ\text{C}$$ and has been falling at a constant rate of $$3^\circ\text{C}$$ per hour. If it continues to fall at this rate, what was the temperature 4.5 hours ago? Explain or show your reasoning.