Curriculum / Math / 3rd Grade / Unit 3: Multiplication and Division, Part 2 / Lesson 20
Math
Unit 3
3rd Grade
Lesson 20 of 23
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Lesson Notes
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Solve two-step word problems involving all four operations, including multiplying one-digit whole numbers by multiples of 10.
The core standards covered in this lesson
3.NBT.A.3 — Multiply one-digit whole numbers by multiples of 10 in the range 10—90 (e.g., 9 × 80, 5 × 60) using strategies based on place value and properties of operations.
3.OA.D.8 — Solve two-step word problems using the four operations. Represent these problems using equations with a letter standing for the unknown quantity. Assess the reasonableness of answers using mental computation and estimation strategies including rounding. This standard is limited to problems posed with whole numbers and having whole-number answers; students should know how to perform operations in the conventional order when there are no parentheses to specify a particular order (Order of Operations).
The foundational standards covered in this lesson
3.NBT.A.2 — Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and/or the relationship between addition and subtraction.
The essential concepts students need to demonstrate or understand to achieve the lesson objective
Suggestions for teachers to help them teach this lesson
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Tasks designed to teach criteria for success of the lesson, and guidance to help draw out student understanding
25-30 minutes
Act 1: Watch the video Charlie's Gumballs.
a. What do you notice? What do you wonder?
b. How many gumballs are there in total? Make an estimate.
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Charlie's Gumballs by Max Ray is made available on 101Questions under the CC BY 3.0 license. Accessed Nov. 1, 2018, 11:45 a.m..
Act 2: Use the following information to determine how many gumballs there are in total:
Act 3: He started with 120 gumballs. Was your estimate reasonable? Why or why not?
15-20 minutes
Problem Set
A task that represents the peak thinking of the lesson - mastery will indicate whether or not objective was achieved
5-10 minutes
A potter sold 80 vases for $9 each. The potter uses $75 of the money he makes to buy more clay and keeps the rest as spending money. How much spending money does the potter have?
a. Write an equation or equations with a letter for the unknown quantity to represent the situation.
b. Find the solution. Show or explain your work.
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
Help students strengthen their application and fluency skills with daily word problem practice and content-aligned fluency activities.
Next
Identify patterns in single or multiple rows/columns of the multiplication table.
Topic A: Introduction to The Properties of Operations
Study commutativity to find known facts of 6, 7, 8, and 9.
Standards
3.OA.B.53.OA.D.9
Understand the zero and identity properties of multiplication.
3.OA.A.43.OA.B.53.OA.C.73.OA.D.9
Understand the role of parentheses and apply to solving problems.
3.OA.B.53.OA.D.8
Introduce the distributive property of multiplication.
Introduce the associative property of multiplication.
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Topic B: Multiplication and Division by 6 and 7
Build fluency with multiplication and division facts using units of 6.
3.OA.A.43.OA.C.7
Build fluency with multiplication and division facts using units of 7.
Use the associative property as a strategy to multiply by units of 6.
3.OA.B.53.OA.C.73.OA.D.9
Use the distributive property as a strategy to multiply by units of 6.
Use the distributive property as a strategy to multiply by units of 7.
Solve one- and two-step word problems involving units up to 7.
3.OA.A.33.OA.D.8
Topic C: Multiplication and Division by 8 and 9
Build fluency with multiplication and division facts using units of 8 and 9.
Use the associative property as a strategy to multiply by units of 8 and 9.
Use the distributive property as a strategy to multiply by units of 8 and 9.
Use the distributive property as a strategy to multiply by units of 8 and 9, including the subtractive use of the distributive property.
Solve one- and two-step word problems involving units up to 9.
Topic D: Multiplication and Division by Values Greater than 10
Multiply one-digit whole numbers by multiples of 10.
3.NBT.A.33.OA.A.43.OA.B.5
Multiply one-digit whole numbers by two-digit whole numbers using the associative and distributive properties.
Topic E: Two-Step Word Problems and Patterns in Arithmetic
Solve two-step word problems involving all four operations.
3.OA.D.8
3.NBT.A.33.OA.D.8
3.OA.C.73.OA.D.9
Identify other patterns in the multiplication table.
3.OA.D.9
Identify arithmetic patterns and explain them using properties of operations.
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