Topic F: Part 1: Understanding Factor Pairs

Multiple Choice

Why is it important to understand factor pairs when studying numbers?

• Because it helps in identifying prime and composite numbers

• Because it makes addition easier

• Because it helps in learning multiplication tables

• Because it is needed for geometry

Multiple Select

Which of the following statements is a true way to multiply two whole numbers to get 8?

• 2 × 4 = 8

• 3 × 3 = 8

• 1 × 8 = 8

• 5 × 2 = 8

Open Ended

Describe the steps to find all factor pairs for a given number.

Open Ended

How can you use rectangles to visualize factor pairs as area models?

Open Ended

What is the difference between a prime number and a composite number based on factor pairs?

Multiple Choice

Which of the following is a correct definition of a composite number?

• A whole number greater than 1 that has exactly one factor pair: (1, n).

• A whole number greater than 1 that has more than one factor pair.

• A number that cannot be divided by any other number.

• A number that is less than 1.

Multiple Select

Based on the activities in the slides, which numbers between 10 and 30 are likely to be composite? Select all that apply.

• 11

• 12

• 13

• 14

Open Ended

List all the factor pairs for 18. Is 18 prime or composite? Explain your reasoning.

Open Ended

Find all the factor pairs for 25. Is 25 prime or composite? How do you know?

Open Ended

List all the factor pairs for 16. How do you know you found them all?

Multiple Choice

Which of the following numbers is a composite number?

• 13

• 17

• 25

• 19

Multiple Choice

By the end of this lesson, what should you be able to do?

• Find all the factor pairs for a number and tell if it’s prime or composite.

• Memorize all prime numbers up to 100.

• Solve equations using factorization.

• Draw factor trees for every number.

Open Ended

What is one thing you learned today about factor pairs or identifying prime and composite numbers?