Curriculum / Math / 3rd Grade / Unit 2: Multiplication and Division, Part 1 / Lesson 8
Math
Unit 2
3rd Grade
Lesson 8 of 21
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Build fluency with division facts using units of 2, 5, and 10.
The core standards covered in this lesson
3.OA.A.2 — Interpret whole-number quotients of whole numbers, e.g., interpret 56 ÷ 8 as the number of objects in each share when 56 objects are partitioned equally into 8 shares, or as a number of shares when 56 objects are partitioned into equal shares of 8 objects each. For example, describe a context in which a number of shares or a number of groups can be expressed as 56 ÷ 8.
3.OA.B.6 — Understand division as an unknown-factor problem. For example, find 32 ÷ 8 by finding the number that makes 32 when multiplied by 8.
3.OA.C.7 — Fluently multiply and divide within 100, using strategies such as the relationship between multiplication and division (e.g., knowing that 8 × 5 = 40, one knows 40 ÷ 5 = 8) or properties of operations. By the end of Grade 3, know from memory all products of two one-digit numbers.
The essential concepts students need to demonstrate or understand to achieve the lesson objective
Suggestions for teachers to help them teach this lesson
To achieve fluency, the goal is to help students move along this progression, eventually to the point of "just knowing" products and quotients.
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Tasks designed to teach criteria for success of the lesson, and guidance to help draw out student understanding
Maureen says the skip-counting sequence "10, 20, 30, 40, 50, 60" to help her solve a problem.
a. What multiplication problem might Maureen be trying to solve? How do you know?
b. What if Maureen was solving a division problem? What problem might that have been?
Solve.
a. $$12\div2 =$$ _____
b. _____ $$=35\div 5$$
c. $$90\div 10=$$ _____
d. _____ $$\times\:5 = 45$$
e. $$2 \:\times$$ _____ $$=16$$
Problem Set
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A task that represents the peak thinking of the lesson - mastery will indicate whether or not objective was achieved
a. $$90 \div 10 =$$ _____
b. ____ $$\times\space 2 = 8$$
c. $$40 = 5\space\times $$ _____
The Extra Practice Problems can be used as additional practice for homework, during an intervention block, etc. Daily Word Problems and Fluency Activities are aligned to the content of the unit but not necessarily to the lesson objective, therefore feel free to use them anytime during your school day.
Extra Practice Problems
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Help students strengthen their application and fluency skills with daily word problem practice and content-aligned fluency activities.
Lesson 7
Lesson 9
Topic A: The Meaning of Multiplication and Division
Identify and create situations involving equal groups and describe these situations using the language and notation of multiplication.
3.OA.A.1
Identify and create situations involving arrays and describe these situations using the language and notation of multiplication.
Identify and create situations involving unknown group size and find group size in situations.
3.OA.A.1 3.OA.A.2 3.OA.A.3
Identify and create situations involving an unknown number of groups and find the number of groups in situations.
Relate multiplication and division and understand that division can represent situations of unknown group size or an unknown number of groups.
3.OA.A.1 3.OA.A.2 3.OA.A.3 3.OA.B.6
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Topic B: Multiplication and Division by 2, 5, and 10
Build fluency with multiplication facts using units of 2, 5, and 10.
3.OA.A.1 3.OA.C.7
Demonstrate the commutativity of multiplication.
3.OA.B.5
3.OA.A.2 3.OA.B.6 3.OA.C.7
Solve one-step word problems involving multiplication and division using units of 2, 5, and 10.
Topic C: Multiplication and Division by 3 and 4
Build fluency with multiplication and division facts using units of 3.
3.OA.A.1 3.OA.A.2 3.OA.B.5 3.OA.B.6 3.OA.C.7
Build fluency with multiplication and division facts using units of 4.
Solve one-step word problems involving multiplication and division using units of 3 and 4.
Topic D: More Complex Multiplication and Division Problems
Determine the unknown whole number in a multiplication or division equation relating three whole numbers, including equations with a letter standing for the unknown quantity.
3.OA.A.4 3.OA.C.7 3.OA.D.8
Solve one-step word problems involving multiplication and division and write problem contexts to match expressions and equations.
Solve two-step word problems involving multiplication and division.
3.OA.D.8
Solve two-step word problems involving all four operations.
Topic E: Scaled Picture and Bar Graphs
Create scaled picture graphs where the scale is provided.
3.MD.B.3
Create scaled picture graphs where the scale must be determined.
Create scaled bar graphs where the scale is provided.
Create scaled bar graphs where the scale must be determined.
Solve one- and two-step word problems using information presented in scaled picture and bar graphs.
3.MD.B.3 3.OA.D.8
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