Percentage Calculations and Applications

This video tutorial covers benchmark percentages, including methods to quickly find 50% of a number, calculating percentages of distances, and solving percentage problems involving discounts and money. It also evaluates a method for finding 20% of a number and includes a problem-solving exercise involving distance calculation.

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

• Divide the number by 2

• Multiply the number by 2

• Subtract 5 from the number

• Add 10 to the number

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

• $385

• $300

• $315

• $350

What percentage of 30 is 15?

• 50%

• 100%

• 75%

• 25%

If 3 is what percentage of 12?

• 30%

• 20%

• 10%

• 25%

What percentage of 10 is 6?

• 70%

• 60%

• 50%

• 40%

How does Noah find 20% of a number?

• Subtract 20

• Add 20

• Divide by 5

• Multiply by 2

Why does dividing by 5 give you 20% of a number?

• Because 5 is half of 10

• Because 5 is a prime number

• Because dividing by 5 is the same as multiplying by 1/5

• Because 5 is a factor of 20

How much money does Diego have if he has 75% of $10?

• $2.50

• $10.00

• $7.50

• $5.00

How much money does Noah have if he has 25% of $30?

• $2.50

• $10.00

• $7.50

• $5.00

How far apart are Lynn and Andre after 1 hour if they start 22 miles apart?

• 15 miles

• 20 miles

• 16.5 miles

• 18 miles