Lesson 7

Purchasing with Pennies

Est. Class Sessions: 2
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Mathematical Standards

1.OA.A
Represent and solve problems involving addition and subtraction. (1.OA.A.1, 1.OA.A.2)
1.OA.C
Add and subtract within 20. (1.OA.C.6)

Standards for Mathematical Practice

MP1.
Make sense of problems and persevere in
solving them.
MP2.
Reason quantitatively.
MP4.
Model with mathematics.
MP5.
Use appropriate tools strategically.
MP6.
Attend to precision.

Students solve problems as they use pennies and price tags to "purchase" items in a classroom store. They explore multiple strategies for finding solutions.

Content in this Lesson

  • Solving addition problems using the counting-on strategy [E5].
  • Representing addition situations using ten frames, counters, number lines, and number sentences [E6].
  • Solving addition word problems (e.g., adding to, putting together, and comparing) involving two whole numbers whose sum is less than or equal to 20 using a ten frame [E7].
  • Finding a strategy for solving an addition problem [MPE2].
  • Explaining a solution to an addition problem [MPE5].
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Materials for Students

Daily Practice and Problems Lesson Homework Assessment

Student Books
Student Activity Book

Teacher Resources

 Teacher Guide - digital

Supplies for Students

12–15 pennies or other counters
20 connecting cubes

Materials for the Teacher

Display of Math Practices (Student Activity Book) Reference
Display of the Two Ten Frames Master (Teacher Guide)
Unit 3 Assessment Record
Unit 3 Individual Assessment Record

Materials Preparation

Display "Store" Items. Create a display of items with price tags as shown in Figure 1. You may also bring in four or five objects and add your own price tags. The objects can be thematically related, such as items found in a toy store or school supplies. Classroom items (e.g., sticker, pencil, crayon, and eraser) can also be identified. Students may contribute items from their desks for the display. The display needs to be easily seen by all students.


Figure 1: Items with price tags

Assessment in this Lesson

Assessment Expectation Assessed Math Practices
Expectation Assessed
Purchasing with Pennies
Observe
Teacher Guide - digital
E6.
Represent addition situations using drawings, diagrams, ten frames, counters, number lines, and number sentences.
E7.
Solve addition word problems (e.g., adding to, putting together, comparing) involving two or three whole numbers whose sum is less than or equal to 20 using counters and ten frames.
MPE2.
Find a strategy. I choose good tools and an efficient strategy for solving the problem.
MPE5.
Show my work. I show or tell how I arrived at my answer so someone else can understand my thinking.
DPP Item Y
Penny Problems 3
Teacher Guide - digital
E7.
Solve addition word problems (e.g., adding to, putting together, comparing) involving two or three whole numbers whose sum is less than or equal to 20 using counters and ten frames.

Vocabulary in this Lesson