Understanding Proportions and Percentages

Mrs. Bobby teaches lesson 26 on percents and proportions, focusing on calculating percentages of animals and applying these concepts to real-life situations like discounts. The lesson includes solving proportions using cross multiplication and emphasizes understanding the part-whole relationship in percentages.

What is the formula for calculating the percentage of a part in relation to a whole?

• Whole times part equals percent over 100

• Whole over part equals percent over 100

• Part over whole equals percent over 100

• Part times whole equals percent over 100

In the example with mammals, what percentage of the total do they represent?

• 25%

• 100%

• 50%

• 75%

What is the first step in solving a proportion using cross multiplication?

• Divide the numbers

• Multiply the means and extremes

• Subtract the numbers

• Add the numbers

How is 15/60 simplified in the example with reptiles and amphibians?

• 1/2

• 1/5

• 1/3

• 1/4

What percentage of the total do reptiles and amphibians represent?

• 30%

• 25%

• 20%

• 10%

In the real-life example, what is the original price of the sweater?

• $32

• $28

• $36

• $24

What is the discount percentage applied to the sweater?

• 15%

• 25%

• 10%

• 20%

How much money does the shopper save on the sweater?

• $6

• $7

• $9

• $8

What is the final price of the sweater after the discount?

• $20

• $32

• $24

• $28

Why is understanding percents and proportions important?

• It is not important

• It is only important for math exams

• It is useful in everyday calculations like discounts

• It helps in solving algebraic equations