Modeling Subtraction of Fractions with Unlike Denominators

The video tutorial teaches how to solve word problems involving the subtraction of fractions with unlike denominators by using visual models. It emphasizes the importance of not subtracting numerators and denominators directly and provides examples to illustrate the correct method. The tutorial includes two example problems: one involving paint and another involving a flower, demonstrating how to use models to find the solution.

What is a common mistake when subtracting fractions with unlike denominators?

• Adding the fractions instead of subtracting

• Finding a common denominator before subtracting

• Using a model to visualize the fractions

• Subtracting the numerators and denominators directly

In the paint problem, what is the initial amount of paint?

• 1/2 gallon

• 5/6 gallon

• 2/6 gallon

• 1 gallon

After using 1/2 gallon of paint, how much paint is left?

• 4/6 gallon

• 2/6 gallon

• 3/6 gallon

• 1/6 gallon

How tall is the flower initially in the flower height problem?

• 3/4 feet

• 1/4 feet

• 7/8 feet

• 5/8 feet

After Marie cuts off 1/4 of a foot, how tall is the flower?

• 3/8 feet

• 5/8 feet

• 6/8 feet

• 7/8 feet