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

Last updated 9 months ago
8 questions
1

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

1

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

1

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

1

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

1

Explain how to calculate these mentally.
  1. 15 is what percentage of 30?
  2. 3 is what percentage of 12?
  3. 6 is what percentage of 10?

1

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?

1

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?

1

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.

Source: Open Up Resouces (Download for free at openupresources.org.)