Lesson 13: Benchmark Percentages | Unit 3: Unit Rates and Percentages

Multiple Choice

What is a quick way to find 50% of a number in your head?

• Divide the number by 2.
• Multiply the number by 2.
• Add 50 to the number.
• Subtract 25 from the number.

Multiple Choice

Andre lives 1.6 km from school. What is 50% of 1.6 km?

• 0.8 km
• 2.0 km
• 0.4 km
• 1.2 km

Multiple Choice

Diego lives $$\frac{1}{2}$$ mile from school. What is 50% of $$\frac{1}{2}$$ mile?

• $$\frac{1}{2}$$ mile

• $$\frac{1}{8}$$ mile

• $$\frac{3}{4}$$ mile

• $$\frac{1}{4}$$ mile

Multiple Choice

There is a 10% off sale on laptop computers. If someone saves $35 on a laptop, what was its original cost?

• 400
• 450
• 300
• 350

Open Ended

Explain how to calculate this mentally: 15 is what percentage of 30?

Open Ended

Explain how to calculate this mentally: 3 is what percentage of 12?

Open Ended

Explain how to calculate this mentally: 6 is what percentage of 10?

Open Ended

Noah says that to find 20% of a number he divides the number by 5. For example, 20% of 60 is 12, because $$60 \div 5 = 12$$ . Does Noah’s method always work? Explain why or why not.

Open Ended

For a science experiment, students need to find 25% of 60 grams. Jada says, “I can find this by calculating $$\frac{1}{4}$$ of 60.” Andre says, “25% of 60 means $$\frac{25}{100} \cdot 60$$ .” Do you agree with either of them? Explain your reasoning.

Open Ended

Jada’s community is raising money to build a new park. What percentage of their fundraising goal have they met so far? Show or explain your reasoning.