Lesson 2

Cover Up: Fact Families

Est. Class Sessions: 1
X

Mathematical Standards

2.MD.B
Relate addition and subtraction to length. (2.MD.B.6)
2.OA.A
Represent and solve problems involving addition and subtraction. (2.OA.A.1)
2.OA.B
Add and subtract within 20. (2.OA.B.2)
2.NBT.A
Understand place value. (2.NBT.A.1)
2.NBT.B
Use place value understanding and properties of operations to add and subtract. (2.NBT.B.7, 2.NBT.B.8)

Standards for Mathematical Practice

MP1.
Make sense of problems and persevere in
solving them.
MP2.
Reason quantitatively.
MP5.
Use appropriate tools strategically.

Students investigate fact families. They practice writing related addition and subtraction sentences while playing the Cover Up game. The game prepares students for a more complete discussion of subtraction strategies in Lesson 3.

Content in this Lesson

  • Representing addition and subtraction using multiple representations such as counters and number sentences [E3].
  • Solving subtraction problems using counting strategies [E5].
  • Using mental math strategies and reasoning strategies (e.g., using doubles, using ten, making ten, reasoning from known facts) to solve addition and subtraction problems within 20 [E6].
  • Naming facts in a fact family.

Daily Practice and Problems E–F

E. Lots of Animals

F. Coin Jar 1

X

Materials for Students

Daily Practice and Problems Lesson Homework Assessment

Student Books

 Student Activity Book

Teacher Resources

 Teacher Guide - digital

Supplies for Student Pairs

20 beans
desk number lines (0–100)
connecting cubes

Materials for the Teacher

Display of first page of Cover Up (Student Activity Book) Page 109
Unit 3 Assessment Record
20 beans

Materials Preparation

Prepare Optional Targeted Practice. Place copies of the Cover Up page from the Student Activity Book in a learning center with sets of 20 beans.

Assessment in this Lesson

ASSESSMENT EXPECTATION ASSESSED
Bean Cover Up
Student Activity Book
Pages 111–113
E3.
Represent addition and subtraction using multiple representations (e.g., stories, drawings, diagrams, counters, number sentences, number lines,
200 Chart).
E5.
Solve subtraction problems using counting strategies.
E6.
Use mental math strategies and reasoning strategies (e.g., using doubles, using ten, making ten, reasoning from known facts) to solve addition and subtraction problems within 20.

Vocabulary in this Lesson