Teaching Fractions, Percents, and Decimals Effectively

Miranda Stanglin, a mathematician, explains how to teach decimals, percents, and fractions to eighth graders. She demonstrates the conversion between these forms using real-world examples, such as sales discounts. The video covers converting decimals to percents and fractions, fractions to decimals and percents, and percents to fractions and decimals. Practical applications, like baking and shopping, are discussed to highlight the importance of these conversions in everyday life.

What are the three different ways to represent the same value?

• Addition, subtraction, and multiplication

• Meters, liters, and grams

• Decimals, fractions, and percentages

• Algebra, geometry, and calculus

What is the equivalent fraction of 50%?

• 3/4

• 2/5

• 1/4

• 1/2

How do you convert 0.75 to a percentage?

• Move the decimal point two places to the right

• Divide by 100

• Multiply by 100

• Move the decimal point two places to the left

What is the reduced form of 75/100?

• 15/20

• 7/10

• 75/100

• 3/4

What is the process to reduce a fraction?

• Subtract the denominator from the numerator

• Multiply both the numerator and denominator by 100

• Divide both the numerator and denominator by their greatest common divisor

• Add the numerator to the denominator

How do you convert a fraction to a decimal?

• Divide the numerator by the denominator

• Multiply the numerator by the denominator

• Add 100 to the numerator

• Subtract the denominator from the numerator

How is the decimal 0.2 represented as a percentage?

• 20%

• 2%

• 200%

• 0.2%

What fraction represents 25%?

• 1/4

• 1/2

• 25/100

• 2/5

What is the decimal form of 25%?

• 0.25

• 25

• 0.025

• 2.5

How can you convert a percentage to a decimal?

• Divide by 100

• Multiply by 100

• Move the decimal point two places to the right

• Move the decimal point two places to the left