Subtraction of Fractions: Creating Like Denominators

This video tutorial teaches how to solve word problems involving the subtraction of fractions with unlike denominators by creating like denominators. It uses models to visualize fractions and explains common mistakes to avoid. Two example problems are solved: one involving a cat's food and another with a coffee pot, demonstrating the process of finding common denominators and subtracting fractions.

What is the first step in solving word problems involving subtraction of fractions with unlike denominators?

• Add the fractions first.

• Subtract the numerators directly.

• Multiply the fractions.

• Find a common denominator.

How can whole numbers be represented as fractions?

• By using different numbers for numerator and denominator.

• By using one as the denominator.

• By using the same number for numerator and denominator.

• By using zero as the numerator.

What mistake should be avoided when subtracting fractions with unlike denominators?

• Multiplying by a whole.

• Using models to visualize fractions.

• Finding a common denominator.

• Subtracting the numerators and denominators directly.

In the example with the cat's food, what is the equivalent fraction of 5/6 when converted to a common denominator?

• 25/30

• 15/18

• 20/24

• 10/12

What is the result of subtracting 6/24 from 20/24 in the cat's food problem?

• 12/24

• 16/24

• 10/24

• 14/24

In the coffee pot problem, what is the equivalent fraction of 2/3 when converted to a common denominator?

• 4/6

• 5/6

• 3/6

• 6/6

After converting to a common denominator, what is the result of subtracting 3/6 from 4/6 in the coffee pot problem?

• 0/6

• 1/6

• 2/6

• 3/6