Unit 3, Lesson 12

Subtract from a Teen Number

Grade 1

Preparation

Lesson Narrative

In previous lessons, students learned the 1 structure of teen numbers and considered the relationship between addition and subtraction. The purpose of this lesson is for students to use their understanding of the structure of teen numbers to add and subtract from a teen number, without composing or decomposing a ten (MP7). Students solve problems in ways that make sense to them including approaches from a previous section, such as counting on, taking away, or relating addition and subtraction.

Representation

MLR8

Learning Goals

Explain (orally and with words or other representations) strategies for finding the number that makes addition and subtraction equations within 20 true.
Explain (orally) strategies for solving a Take From, Result Unknown problem where a one-digit number is subtracted from a teen number.

Student-Facing Goal

Let’s subtract and add within 20.

Student Lesson

Required Materials

Activity 1

Activity 2

Activity 3

Required Preparation

Activity 3

Each group of 2 needs 20 two-color counters and a cup (at least 8 oz).

Suggested Centers

None

Teacher Reflection Questions

What connections did students make between the different methods shared? What questions did you ask to help make the connections more visible?

Lesson | Prep | Loading...

Settings

Language

Audience

Assessment Access

Subtract from a Teen Number

Preparation

Lesson Narrative

Learning Goals

Student-Facing Goal

Required Materials

Activity 1

Activity 2

Activity 3

Required Preparation

Activity 3

Suggested Centers

Teacher Reflection Questions

Standards Alignment

Building On

Addressing

1.NBT.A.1

1.OA.A.1

1.OA.B.4

1.OA.C.6

1.OA.D.8

Building Toward

Lesson Timeline

Teacher Support

Student Handouts

Student Task Statements

Blackline Masters