Multiplying and Simplifying Fractions

Lesson 4.1 covers applying the greatest common factor (GCF) and least common multiple (LCM) to fraction operations. It begins with simplifying fractions using GCF, followed by adding and subtracting fractions with LCM. The lesson then explains multiplying fractions and introduces the cross cancellation technique to simplify the process. Examples are provided to compare straight multiplication with cross cancellation. The lesson concludes with multiplying fractions by whole numbers and a preview of the next lesson on adding and subtracting fractions.

What is the main focus of lesson 4.1?

• Dividing fractions

• Multiplying fractions

• Subtracting fractions

• Adding fractions

What is the purpose of using the Greatest Common Factor (GCF) in fraction operations?

• To simplify fractions

• To find the sum of fractions

• To multiply fractions

• To divide fractions

Which video is linked for learning about GCF?

• Video 2.1

• Video 1.1

• Video 4.1

• Video 3.1

What is the Least Common Multiple (LCM) used for in fraction operations?

• To multiply fractions

• To simplify fractions

• To add and subtract fractions

• To divide fractions

Which video is linked for learning about LCM?

• Video 4.2

• Video 2.2

• Video 1.2

• Video 3.2

What is the first step in multiplying two fractions?

• Add the numerators

• Multiply the numerators

• Subtract the denominators

• Divide the denominators

How can you avoid simplifying after multiplying fractions?

• By dividing the fractions

• By subtracting the fractions

• By adding the fractions

• By using cross-cancellation

What is the benefit of using cross-cancellation?

• It subtracts fractions

• It adds fractions

• It simplifies fractions before multiplying

• It makes fractions larger

How do you multiply a fraction by a whole number?

• Add the whole number to the fraction

• Divide the whole number by the fraction

• Subtract the whole number from the fraction

• Write the whole number with a denominator of one

What is the result of multiplying 5/9 by 4?

• 4/9

• 20/9

• 5/36

• 9/20