Videos and lessons to help Grade 4 students learn to apply and extend previous understandings of multiplication to multiply a fraction by a whole number.

A. Understand a fraction

B. Understand a multiple of a/b as a multiple of 1/b, and use this understanding to multiply a fraction by a whole number.

C. Solve word problems involving multiplication of a fraction by a whole number, e.g., by using visual fraction models and equations to represent the problem.

Common Core: 4.NF.4

- I can explain why a/b = a × 1/b using models. For example, 3/4 = 1/4 + 1/4 + 1/4 = (3 × 1/4).
- I can decompose a fraction into multiple unit fractions. 5 × 7/8 = 5 × (7 × 1/8) = (5 × 7) × 1/8 = 35 × 1/8 or 35/8.
- I can solve word problems that involve a whole number and a fraction.

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More Lessons for Grade 4

Common Core for Grade 4

In this lesson you will learn how to multiply a fraction by a whole number by using visual models and repeated addition.

Multiply fractions by whole numbers using models - 4.NF.4

In this lesson you will learn how to multiply fractions by a whole number using visual fraction models.

Multiply fractions by whole numbers using repeated addition

In this lesson you will learn how to multiply fractions by a whole number using repeated addition.

Multiply a fraction by a whole number.

Multiplying Fractions and Whole Numbers.

This video applies multiplying a fraction by a whole number to solve word problems. He uses the Singapore math modeling strategy of a bar model and the "unitary method" to illustrate 4.NF.4.c in the grade 4 Common Core Standards for Mathematics.

Example: Sean has 63 classical songs on his mp3 player. That's 7/8 of his entire collection. How many songs does Sean have altogether?

Multiplying Fractions and Whole Numbers -Word Problems

This video walkthrough lesson takes an in-depth look at multiplying fractions and whole numbers in a word problem format.

Example: Kayen drinks 3/4 of a bottle of coconut delight everyday. How much juice will he drink in five days?

Multiplying Fractions By Whole Numbers - Pizza by the Fraction

Example: Maria and Luigi decide to open up a pizza shape. For each pizza they charge $12. It's an additional $3 per topping for each whole pizza. Pizza are scaled according to the size of each slice. How much would they charge for each slice in the pizza shown below?

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