Exploring Multiplication with Strip Diagrams

Harper, a third grader, teaches how to solve a multiplication problem using a strip diagram. She explains the problem of finding the total number of seashells when given five dozen. Harper demonstrates how to convert the problem into a statement, draw a strip diagram with groups representing dozens, and calculate the total using multiplication. The solution is found by multiplying 5 by 12, resulting in 60 seashells.

What does a dozen represent in terms of quantity?

• 20

• 12

• 5

• 10

What is the first step in solving the problem using a strip diagram?

• Identifying the number of groups

• Calculating the total

• Drawing the diagram

• Converting the question into a statement

Tags

CCSS.2.OA.A.1

How many groups are used in the strip diagram for this problem?

• 10

• 60

• 12

• 5

Tags

CCSS.2.OA.A.1

Why is a question mark used in the strip diagram?

• To mark the end of the diagram

• To indicate the unknown total

• To show the number of groups

• To represent the number 12

Tags

CCSS.2.OA.A.1

What multiplication equation represents the problem?

• 60 / 12 = 5

• 12 / 5 = 2.4

• 5 * 12 = 60

• 5 + 12 = 17

Tags

CCSS.5.NF.B.3

What is the total number of seashells found by Mom?

• 60

• 120

• 72

• 50

Tags

CCSS.1.NBT.A.1