Videos to help Grade 4 students learn how to find factor pairs for numbers to 100 and use understanding of factors to define prime and composite.

Common Core Standards: 4.OA.4

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Lessons for Grade 4

Common Core For Grade 4

Problem 1: Identify the factors and product represented in an array.

Display a 1 × 8 array and a 2 × 4 array.

Problem 2: Identify factors to define prime and composite numbers.

Problem 3: Identify factors of numbers and determine if they are prime or composite.

1. Record the factors of the given numbers as multiplication sentences and as a list in order from least to greatest. Classify each as prime (P) or composite (C). The first problem is done for you.

a. 4

1 × 4 = 4 2 × 2 = 4

The factors of 4 are:

1,2, and 4

b. The factors of 6 are:

c. The factors of 7 are:

d. The factors of 9 are:

3. Bryan says all prime numbers are odd numbers.

a. List all of the prime numbers less than 20 in numerical order.

b. Use your list to show that Bryan’s claim is false.

1. Record the factors of the given numbers as multiplication sentences and as a list in order from least to greatest. Classify each as prime (P) or composite (C).

2. Find all factors for the following numbers and classify as prime or composite. Explain your classification of each as prime or composite.

3. Bryan says that only even numbers are composite.

a. List all of the odd numbers less than 20 in numerical order.

b. Use your list to show that Bryan’s claim is false.

4. Julie has 27 grapes to divide evenly among 3 friends. She thinks there will be no leftovers. Use what you know about factor pairs to explain if Julie is correct.

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