Lesson 7

Restemos dos dígitos

Lesson Purpose

The purpose of this lesson is for students to subtract a two-digit number from a two-digit number when a ten is decomposed when subtracting by place.

Lesson Narrative

In previous lessons, students learned that decomposing a ten is sometimes necessary when subtracting two numbers. Students used connecting cubes and base-ten blocks to represent their methods when subtracting a one-digit number from a two-digit number.

In the fist activity, students use methods that make sense to them to subtract and compare their methods with a partner. In the activity synthesis, students make connections across different methods and representations and consider which tools and representations work best for them. In the second activity, students use base-ten blocks to represent expressions and decompose a ten when subtracting by place.

Students should have access to connecting cubes and base-ten blocks throughout the lesson and the cool-down.

  • Representation

Learning Goals

Teacher Facing

  • Subtract a two-digit number from a two-digit number in a way that makes sense to them.

Student Facing

  • Hagamos restas con números de dos dígitos.

Required Materials

Materials to Gather

Materials to Copy

  • Using Blocks to Take Away, Spanish

Required Preparation

Activity 2:

  • Create a set of cards from the blackline master for each group of 4.

CCSS Standards


Building Towards

Lesson Timeline

Warm-up 10 min
Activity 1 15 min
Activity 2 20 min
Lesson Synthesis 10 min
Cool-down 5 min

Teacher Reflection Questions

How are base-ten blocks and diagrams supporting students in showing what they understand about decomposing a ten when subtracting by place?

Suggested Centers

  • Capture Squares (1–3), Stage 3: Add within 20 (Addressing)
  • Five in a Row: Addition and Subtraction (1–2), Stage 6: Add within 100 with Composing (Addressing)
  • Target Numbers (1–5), Stage 4: Subtract Tens or Ones (Addressing)

Print Formatted Materials

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Student Task Statements pdf docx
Lesson Cover Page pdf docx
Cool Down Log In
Teacher Guide Log In
Teacher Presentation Materials pdf docx
Blackline Masters zip