Multiply and Divide 7's using Number Bonds

Videos and solutions to help Grade 3 students learn how to count by units of 7 to multiply and divide using number bonds to decompose.

Common Core Standards: 3.OA.3, 3.OA.4, 3.OA.5, 3.OA.7, 3.OA.9, 3.OA.1, 3.OA.2, 3.OA.6

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

Application Problem

Gracie draws 7 rows of stars. In each row, she draws 4 stars. How many stars does Gracie draw in all? Use a letter to represent the unknown and solve.

Note: This problem reviews the G3–M1 concept of multiplying using units of 4. It will be used in the Concept Development to lead into skip-counting by sevens. Be sure to circulate and find a student’s work to be used as an example in the Concept Development (find a student who counted by four 7 times to solve the problem).

Concept Development

Part 1: Use number bonds to decompose and make ten as a strategy for skip-counting units of 7.

Part 2: Skip-count by seven to solve multiplication and division problems.

Count by units of 7 to multiply and divide using number bonds to decompose.
Number bonds to decompose numbers for skip counting
Skip-count by seven 4 times.

Lesson 5 Homework

1. Use number bonds to help you skip-count by seven by making ten or adding to the ones.
2. Skip-count by seven to fill in the blanks. Then use the multiplication equation to write the related division fact directly to the right.

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