Open Up - Grade 6 - Mathematics - Unit 3 - Lesson 13

How can you find 50% of a number quickly in your head?

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

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Diego lives 1/2 mile from school. What is 50% of 1/2 mile?

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

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Explain how to calculate these mentally.15 is what percentage of 30?3 is what percentage of 12?6 is what percentage of 10?

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Noah says that to find 20% of a number he divides the number by 5. For example, 20% of 60 is 12, because 60/5 = 12. Does Noah’s method always work?

• Yes
• No

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Diego has 75% of $10. Noah has 25% of $30. Diego thinks he has more money than Noah, but Noah thinks they have an equal amount of money. Who is right?

• Diego
• Noah

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Lin and Andre start walking toward each other at the same time from opposite ends of 22-mile walking trail. Lin walks at a speed of 2.5 miles per hour. Andre walks at a speed of 3 miles per hour.Here is a table showing the distances traveled and how far apart Lin and Andre were over time. Use the table to find how much time passes before they meet.

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