Multiplication and Division of Whole Numbers

Lesson 2

Math

Unit 2

5th Grade

Lesson 2 of 20

Objective


Write expressions that record calculations with numbers, and interpret expressions without evaluating them.

Common Core Standards


Core Standards

  • 5.OA.A.1 — Use parentheses, brackets, or braces in numerical expressions, and evaluate expressions with these symbols.
  • 5.OA.A.2 — Write simple expressions that record calculations with numbers, and interpret numerical expressions without evaluating them. For example, express the calculation "add 8 and 7, then multiply by 2" as 2 × (8 + 7). Recognize that 3 × (18932 + 921) is three times as large as 18932 + 921, without having to calculate the indicated sum or product.

Foundational Standards

  • 3.OA.D.8

Criteria for Success


  1. Understand the sum to be the result of adding two values, the difference to be the result of subtracting two values, the product to be the result of multiplying two numbers, and the quotient to be the result of dividing two numbers.
  2. Write numerical expressions based on verbal/written descriptions of calculations (e.g., write $$2\times(8+7)$$ to express the calculation “add 8 and 7, then multiply by 2”) (MP.7). 
  3. Write descriptions of calculations based on numerical expressions (e.g., write “add 8 and 7, then multiply by 2” to describe the expression $$2\times(8+7)$$) (MP.7). 
  4. Interpret expressions without evaluating them (MP.2). 

Tips for Teachers


Students should be familiar with the terms sum, difference, product, and quotient from prior grade levels. 

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Anchor Tasks

25-30 minutes


Problem 1

Four expressions are shown in the chart below. For each one, write all the ways to read the expressions that you can think of.

$$6+2$$ $$6-2$$

 

 

 

 

 

 
$$6 \times 2$$ $$6\div2$$

 

 

 

 

 

 

Guiding Questions

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Student Response

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Problem 2

For each problem below, write an expression that records the calculations described, but do not evaluate.

a.   3 times the sum of 26 and 4

b.   The quotient of 15 and 3, subtracted from 60

Guiding Questions

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Student Response

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References

EngageNY Mathematics Grade 5 Mathematics > Module 2 > Topic B > Lesson 3Concept Development

Grade 5 Mathematics > Module 2 > Topic B > Lesson 3 of the New York State Common Core Mathematics Curriculum from EngageNY and Great Minds. © 2015 Great Minds. Licensed by EngageNY of the New York State Education Department under the CC BY-NC-SA 3.0 US license. Accessed Dec. 2, 2016, 5:15 p.m..

Modified by Fishtank Learning, Inc.

Problem 3

Write the following expressions in words: 

a.   $$8\times(15-9)$$

b.   $$(36+20)\div4$$

Guiding Questions

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Student Response

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Problem 4

Below is a picture that represents $$9+2$$.

a.   Draw a picture that represents $$4 \times (9 + 2)$$.

b.   How many times bigger is the value of $$4 \times (9 + 2)$$ than $$9+2$$? Explain your reasoning.

Guiding Questions

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Student Response

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References

Illustrative Mathematics Seeing is Believing

Seeing is Believing, accessed on Dec. 5, 2017, 3:52 p.m., is licensed by Illustrative Mathematics under either the CC BY 4.0 or CC BY-NC-SA 4.0. For further information, contact Illustrative Mathematics.

Problem Set

15-20 minutes


Discussion of Problem Set

  • In #3b some of you wrote 4 x (14 + 26) and others wrote (14 + 26) x 4. Are both expressions acceptable? Explain.
  • Were you able to answer #4 without actually solving Expressions A and B? How? 
  • A student got 85 for #5a. Can you identify the error in thinking?
  • Look at #6. How were you able to answer parts (b) and (c) without knowing how to compute with some of the numbers in the expressions? 
  • Look at #6c. Without evaluating, what would you expect the digits in the first expression to look like compared to the digits in the second expression? Why?
  • We don’t yet know how to find 60 x 225. But, how were you able to use what you learned today to answer #10? 

Target Task

5-10 minutes


Problem 1

Which phrase is represented by the expression $$(22+3)\times 6$$?

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Student Response

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Problem 2

Sam divided the difference of 17 and 5 by 6. Write an expression to match Sam’s calculations. 

Student Response

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Problem 3

Which of the following expressions represents a number that is 4 times as much as the difference of 6358 and 974?

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Student Response

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Additional Practice


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.

Word Problems and Fluency Activities

Word Problems and Fluency Activities

Help students strengthen their application and fluency skills with daily word problem practice and content-aligned fluency activities.

Next

Write expressions that represent real-world situations and evaluate them.

Lesson 3
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Lesson Map

A7CB09C2-D12F-4F55-80DB-37298FF0A765

Topic A: Writing and Interpreting Numerical Expressions

Topic B: Multi-Digit Whole Number Multiplication

Topic C: Multi-Digit Whole Number Division

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