Lesson 2

Fact Families

Est. Class Sessions: 2
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Mathematical Standards

4.NBT.B
Use place value understanding and properties of operations to perform multi-digit arithmetic. (4.NBT.B.5)
4.OA.A
Use the four operations with whole numbers to solve problems. (4.OA.A.3)

Standards for Mathematical Practice

MP1.
Make sense of problems and persevere in solving them.
MP2.
Reason abstractly and quantitatively.

This lesson introduces the yearlong review of the multiplication facts and launches the systematic strategies-based approach to gaining fluency with the division facts. Students learn the connection between multiplication and division through the use of fact families. They solve word problems to develop and enhance their understanding of the division operation. Flash cards are used to assess their fluency with multiplication facts for the fives, tens, and square numbers.

Content in this Lesson

  • Self-assessing fluency with the multiplication facts for the 5s, 10s, and square numbers [E10].
  • Using known multiplication facts to learn related division facts [E11].
  • Using turn-around facts to solve multiplication problems [E8].
  • Multiplying by 0 and 1 [E7].
  • Writing the related number sentences in a fact family [E11].
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Materials for Students

Daily Practice and Problems Lesson Homework Assessment

Student Books

 Student Guide
Student Activity Book

Teacher Resources

 Teacher Guide - digital

Supplies for Students

1 or 2 envelopes for storing flash cards
scissors

Materials for the Teacher

Display of Triangle Flash Cards: 5s, 10s, and Square Numbers (Teacher Guide), optional
Display of Square-Inch Grid Paper from Lesson 1 (Teacher Guide), optional
Unit 3 Assessment Record
Math Facts Class Record

Materials Preparation

Cut Out Flash Cards. Prepare copies on card stock and have students cut apart the Triangle Flash Cards for the 5s, 10s, and Square Numbers and place them in envelopes. You may want to provide each student with two sets, one to use at school and one to take home.

Assessment in this Lesson

Assessment Expectation Assessed
Self Assessment with
Fact Families
Multiplication Facts and Triangle
Flash Cards section
Student Guide
Page 77
E10.
Demonstrate fluency with the multiplication facts for the 5s, 10s, and square numbers.
Fact Families
Check-In: Questions 30–33
Student Guide
Page 78
E7.
Solve multiplication problems using 0 and 1 as factors (applying the multiplication properties of 0 and 1).
E8.
Use turn-around facts to solve multiplication problems (applying the commutative property of multiplication).