Unit 3, Lesson 9
Apply Fraction Multiplication
Grade 5
Activity 1
Flags
Jada has a small replica of the flag of Thailand.
It is 5 inches wide and
- What is the area of the flag? Explain or show your reasoning.
- Each red stripe is
inches wide. What is the area of each red stripe? Explain or show your reasoning. - The blue stripe is
inches wide. What is the area of the blue stripe? Explain or show your reasoning.
Activity 2
More Flags
Rectangle. Partitioned horizontally into 3 rows. Top colored yellow, middle, blue, bottom, red. Yellow row about half width. Other rows, each about 1 fourth width.
Han has a replica of the flag of Colombia.
It is
-
inch. What is the question? -
square inches. What is the question?
Student Section Summary
We learned how to multiply different kinds of fractions.
First, we learned how to multiply a unit fraction by a unit fraction.
Example:
Diagram A shows
Next, we learned how to multiply a unit fraction by a non-unit fraction.
Example:
Diagram B shows
Finally, we learned how to multiply a non-unit fraction by a non-unit fraction.
Example:
Diagram C shows
We can use multiplication to represent the relationship.
- Find the numerator,
- Find the denominator,
- Represent the relationship with an equation: