Calculating Percentages and Ratios

This video tutorial covers solving percentage problems, including calculating percentages of audience sizes and sale prices. It introduces basic concepts of moving decimals and using tape diagrams for visualization. The video also includes practice problems and homework solutions to reinforce learning.

What is the result of multiplying 23 by 100?

• 2300

• 23

• 230

• 2.3

How do you calculate 50% of a number?

• Add 50

• Multiply by 2

• Divide by 2

• Multiply by 0.5

What is 30% of 250?

• 75

• 50

• 100

• 25

How can you represent 140% of a number?

• 1.4 times the number

• 0.14 times the number

• 14 times the number

• 0.014 times the number

What is 44% of 250?

• 110

• 44

• 125

• 100

If 50% of the drama play attendees also attended the concert, how many people attended both?

• 350

• 125

• 175

• 250

What is the sale price of a $10 item at 80% of its regular price?

• $2

• $12

• $10

• $8

How do you find 80% of a number?

• Multiply by 8

• Divide by 0.8

• Divide by 8

• Multiply by 0.8

What is 40% of 75?

• 30

• 25

• 40

• 35

How do you express 40% as a fraction?

• 2/5

• 4/10

• 1/4

• 3/5