Number of Groups in Division

Videos and solutions to help Grade 3 students understand the meaning of the unknown as the number of groups in division.

Common Core Standards:3.OA.1, 3.OA.3

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Lesson Plans and Worksheets for Grade 3

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New York State Common Core Math Module 1, Grade 3, Lesson 5

Lesson 5 Concept Development

Problem 1: Division as fair-share, the unknown as the number of groups.
I am having a party. 18 people are coming. I know that 6 people can sit at each table, but I'm not sure how many tables I'll need.
Problem 2: Relate finding the number of groups to counting by the divisor.
I bought 15 glue sticks. 3 glue sticks come in each pack. How many packs did I buy to get a total of 15?
Problem: Emma is drawing horses. She draws 4 legs on each horse, and a total of 24 legs.
a. Use a count-by to find the number of horses Emma draws. Make a drawing to match your counting.
b. Write a division sentence to represent the problem.

Lesson 5 Homework

3. Divide 12 buckets of paint into groups of 3.

12 ÷ 3 = _______
6. Jacob is drawing cats. He draws 4 legs on each cat, and a total of 24 legs.

a. Use a count-by to find the number of cats Jacob draws. Make a drawing to match your counting.

b. Write a division sentence to represent the problem.

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