lesson 5

Compute with Mass

Est. Class Sessions: 2
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Mathematical Standards

2.NBT.A
Understand place value. (2.NBT.A.2, 2.NBT.A.4)
2.NBT.B
Use place value understanding and properties of operations to add and subtract. (2.NBT.B.5, 2.NBT.B.7)
2.OA.A
Represent and solve problems involving addition and subtraction. (2.OA.A.1)
2.OA.C
Work with equal groups of objects to gain foundations for multiplication. (2.OA.C.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.

Students practice adding two-digit numbers in the context of mass. They play the Make 99 Game in which they practice adding one-digit numbers to two-digit numbers.

Content in this Lesson

  • Composing and decomposing numbers using ones, fives, tens, and
    hundreds [E1].
  • Using words and symbols (e.g., <, >, =) to show comparisons of
    quantities [E2].
  • Recognizing that different partitions of a number have the same total
    (e.g., 50 + 4 = 40 + 14) [E4].
  • Applying the properties of addition (e.g., commutative, associative) to write number sentences that represent mass [E5].
  • Solving addition and subtraction problems (e.g., part-whole, join, take-away, compare) involving mass [E6].
  • Showing or telling how to solve a problem [MPE5].
  • Using labels to show what numbers mean [MPE6].
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Materials for Students

Daily Practice and Problems Lesson Homework Assessment

Student Book

 Student Activity Book

Teacher Resources

 Teacher Guide - digital

Supplies for Student Pairs

standard gram mass sets (one 100-g, two 50-g, ten 20-g, ten 10-g, fifteen 5-g, twenty 1-g masses)
two-pan balance (zeroed in Lesson 1)
envelope for cards

Materials for the Teacher

Display of first Make It Balance page (Student Activity Book) Page 415
Display of first Make 99 Game page (Student Activity Book) Page 421
Unit 8 Assessment Record
Display deck of 4 sets of Digit Cards 0–9
extra copies of Make 99 Game pages (Student Activity Book) Pages 421–424, optional. See Materials Preparation.
standard mass sets (one 100-g, two 50-g, ten 20-g, ten 10-g, fifteen 5-g, twenty 1-g masses)
two-pan balance (zeroed in Lesson 1)

Materials Preparation

Prepare Decks of Cards. Assemble decks of playing cards (four sets of 0–9 digit cards or 4 copies of the Digit Cards 0–9 Master) for each student pair.

Prepare Two-Pan Balances. Assemble the two-pan balances, if necessary. Demonstrate how to zero the balance (make the pans level) and then have students zero the two-pan balance to help them build understanding of how this measurement tool works.

Prepare Make 99 Game for Optional Targeted Practice. Place the Make 99 Game directions, Make 99 Game Board, a deck of 0–9 playing cards (4 sets of 0–9 Digit Cards), and extra copies of the Make 99 Recording Sheet in a center for optional targeted practice.

Prepare Optional Targeted Practice. Place copies of a blank page from the Make It Balance pages from the Student Activity Book, two-pan balances, and standard gram mass sets in a learning center. Students can continue to partition a number in different ways and write equivalent statements.

Assessment in this Lesson

ASSESSMENT EXPECTATION ASSESSED MATH PRACTICES EXPECTATION ASSESSED
Mara’s Lunch
with Feedback Box
Student Activity Book
Pages 425–429
E1.
Compose and decompose numbers using ones, fives, tens, twenties, fifties, and hundreds.
E2.
Use words and symbols (e.g., <, >, =) to show comparisons of quantities.
E4.
Recognize that different partitions of a number have the same total (e.g., 50 + 4 = 40 + 14).
E5.
Apply the properties of addition (e.g., commutative, associative) to write number sentences that represent mass.
E6.
Solve addition and subtraction problems
(e.g., part-whole, join, take away, compare) involving mass.
MPE5.
Show my work. I show or tell how I arrived at my answer so someone else can understand my thinking.
MPE6.
Use labels. I use labels to show what numbers mean.

Vocabulary in this Lesson