UNIT PREPARATION

Display the Math Practices page where all students can see it.

Make a set of Digit Cards 0–9. See the Teacher Notes for DPP item M or
Materials Preparation for Lesson 4.

Attach Small Multiplication Tables to students' desks for reference. See Lesson 8.

Students will need the following tools readily available for the
Daily Practice and Problems items in this unit:

LESSON SESSIONS DESCRIPTION SUPPLIES

LESSON 1

The TIMS Candy Company

 2 To review place value, students use base-ten pieces to keep track of how much candy is made at the TIMS Candy Company. Students practice trading pieces and expressing equivalent amounts in different ways. Students use base-ten shorthand to help them develop pictorial representations of the base-ten system, with the goal of bridging concrete and symbolic representations. Students review the Fewest Pieces Rule.
  • base-ten pieces (2 packs, 14 flats, 30 skinnies, 50 bits)

LESSON 2

Big Base-Ten Hoppers

 2–3 Students develop flexibility composing and decomposing large numbers based on place value concepts. They use moves on number lines to represent moves of ones, tens, hundreds, and thousands to develop mental math skills.
  • base-ten pieces, (about 20 flats, 20 skinnies, 40 bits)

LESSON 3

Number Sentences

 2–3 Students extend the ideas from Lesson 2, Big Base-Ten Hoppers. They write partitions of numbers in number sentences (equations). They identify true or false number sentences and find the value of unknowns to make number sentences true. The terms equation and unknown are introduced in this context.  

LESSON 4

Addition

 2–3 Students review place-value concepts and strategies for adding larger numbers. They make connections between the base-ten representations and paper-and-pencil methods for addition and they develop mental math strategies. The goal of the lesson is to improve students' skills and understanding of concepts so they can choose appropriate methods to solve addition problems efficiently and accurately.
  • base-ten pieces (2 packs, 14 flats, 30 skinnies, 50 bits)
  • storage container

LESSON 5

Subtraction

 2–3 Students improve their understanding of subtraction concepts and their subtraction skills so that they can solve problems efficiently and accurately. Students use base-ten pieces to review paper-and-pencil procedures and develop mental math strategies to subtract. These skills allow students to choose flexibly between using paper and pencil or mental math based on the numbers in the problems and their real-world contexts.
  • base-ten pieces (2 packs, 14 flats, 30 skinnies, 50 bits)
  • storage container

LESSON 6

Adding and Subtracting in Space

 2 Students explore strategies for rounding, estimating, and computing to solve addition and subtraction word problems.  

LESSON 7

Workshop: Addition and Subtraction

 1 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.
  • base-ten pieces (2 packs, 14 flats, 30 skinnies, 50 bits)
  • envelope for Digit Cards 0–9

LESSON 8

Multiplication at the Zoo

 2 Students solve multiplication story problems using their own mental math strategies. They also use expanded form and rectangular arrays to multiply one-digit by two-digit problems. These paper-and-pencil methods provide a conceptual foundation for more efficient procedures. Students then decide whether to estimate or find an exact answer, and then whether to use paper and pencil or mental math.  

LESSON 9

Paper-and-Pencil Multiplication

 2–3 Two commonly used methods for recording work while solving multiplication problems are presented: the all-partials method and the compact method (the United States' traditional multiplication algorithm). Both involve breaking numbers into their base-ten parts and multiplying the parts. The problems in the lesson involve 1-digit by 2-digit multiplication.  

LESSON 10

Multiplication Strategies

 1 Students construct a multiplication strategies menu based on strategies and methods discussed in Lessons 8 and 9. Students then solve multiplication problems using the menu. This lesson is an opportunity to revisit concepts covered earlier in the unit and provides opportunities for practice.  

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