Distance, Time, and Percentage Problems

Mr. Richards reviews practice problems for grade six, unit three, lesson 13. The video covers calculating percentages mentally, understanding discounts, and solving problems involving distance and time. Key topics include finding 50% of a number, calculating original costs from discounts, and using mental math for percentage calculations. The video also explains Noah's method for finding 20% of a number and compares Diego's and Noah's money based on percentages. Finally, it solves a problem involving two people walking towards each other on a trail.

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

• Add 50

• Divide by 2

• Multiply by 2

• Subtract 50

What is 50% of 1.6 kilometers?

• 1.0 kilometers

• 0.6 kilometers

• 1.2 kilometers

• 0.8 kilometers

What is 50% of half a mile?

• 1 mile

• 3/4 mile

• 1/2 mile

• 1/4 mile

If a laptop is on a 10% sale and you save $35, what was the original price?

• $315

• $385

• $300

• $350

What percentage of 30 is 15?

• 75%

• 100%

• 25%

• 50%

How does Noah find 20% of a number?

• Divide by 5

• Multiply by 5

• Divide by 20

• Multiply by 20

Who has more money: Diego with 75% of $10 or Noah with 25% of $30?

• Diego has more

• Cannot be determined

• Noah has more

• They have the same amount

What is the total distance Lin and Andre need to cover to meet?

• 16.5 miles

• 5.5 miles

• 22 miles

• 11 miles

At what speed does Lin walk?

• 2 miles per hour

• 3 miles per hour

• 2.5 miles per hour

• 4 miles per hour

How long does it take for Lin and Andre to meet?

• 5 hours

• 2 hours

• 3 hours

• 4 hours