Workshop: Addition and Subtraction

Est. Class Sessions: 1

Mathematical Standards

4.NBT.A: Generalize place value understanding for multi-digit whole numbers. (4.NBT.A.1, 4.NBT.A.2)
4.NBT.B: Use place value understanding and properties of operations to perform multi-digit arithmetic.(4.NBT.B.4)

Standards for Mathematical Practice

MP1.: Make sense of problems and persevere in solving them.
MP2.: Reason quantitatively.
MP4.: Model with mathematics.
MP6.: Attend to precision.
MP7.: Look for and make use of structure.

In this Workshop, students play the Digits Game and complete problem sets to extend their understanding of the whole number operations covered in Lessons 1–6 and to practice the computation skills involved.

Content in this Lesson

Representing and solving addition and subtraction problems using base-ten pieces [E1, E2, E3].
Using mental math to solve addition and subtraction problems [E4].
Using paper-and-pencil methods to solve addition and subtraction problems [E6, E7].
Choosing from among mental math and paper-and-pencil methods to solve addition and subtraction problems efficiently and accurately [E9].
Communicating strategy solutions verbally and in writing [MPE5].

Daily Practice and Problems Y–Z

Y. How Much Less?

Z. Subtraction

Materials for Students

		Daily Practice and Problems	Lesson	Homework	Assessment
Student Books	Student Guide		Workshop: Addition and Subtraction Pages 152–153	Workshop: Addition and Subtraction Pages 152–153
Student Books	Student Activity Book		Strategies to Add and Subtract Pages 121–134	Strategies to Add and Subtract Pages 121–134	Strategies to Add and Subtract Self-Check: Questions 1, 11–12, 17–18, and 26–28 Pages 121, 125, 129, 132
Teacher Resources	Teacher Guide - digital	DPP Item Y DPP Item Z	Digit Cards 0–9

Supplies for Student Pairs

set of base-ten pieces (2 packs, 14 flats, 30 skinnies, 50 bits)
envelope for Digit Cards 0–9

Materials for the Teacher

Display set of Digit Cards 0–9 from Lesson 4. See Materials Preparation.
Unit 4 Assessment Record

Materials Preparation

Digit Cards. If you did not do so in Lesson 4, ask students to cut apart the Digit Cards 0–9 Master copies and store in an envelope or prepare sets using index cards or a deck of playing cards. If using playing cards, the ace can stand for 1 and a face or joker card can stand for zero. Ask students to keep these sets in a safe place so they can be used to play at home and in future units.

Assessment in this Lesson

Assessment	Expectation Assessed
Strategies to Add and Subtract Self-Check: Question 1 Student Activity Book Page 121	E1. Show that different partitions of the same number are equal using base-ten pieces, number lines, and number sentences (e.g., 200 + 30 + 7 = 200 + 20 = 17). E2. Represent and solve addition problems using base-ten pieces and number lines. E3. Represent and solve subtraction problems using base-ten pieces and number lines.
Strategies to Add and Subtract Self-Check: Questions 11–12 Student Activity Book Page 125	E4. Solve addition and subtraction problems using mental math strategies (e.g., composing and decomposing numbers, counting up, and counting back).
Strategies to Add and Subtract Self-Check: Questions 17–18 Student Activity Book Page 129	E6. Add multidigit numbers using paper-and-pencil methods (expanded form, all-partials, and compact). E7. Subtract multidigit numbers using paper-and-pencil methods (expanded form and compact).
Strategies to Add and Subtract Self-Check: Questions 26–28 Student Activity Book Page 132	E9. Choose appropriately from among mental math, estimation, and paper-and-pencil methods to add and subtract whole numbers.

Unit 4

Unit Overview

Daily Practice and Problems

Lesson 1

Lesson 2

Lesson 3

Lesson 4

Lesson 5

Lesson 6

Lesson 7

Lesson 8

Lesson 9

Lesson 10