Lesson 11

Sumemos decenas a números de dos dígitos

Lesson Purpose

The purpose of this lesson is for students to add a two-digit number and a multiple of 10.

Lesson Narrative

In previous lessons, students added and subtracted multiples of 10 from other multiples of 10. In this lesson, students reason about the value of expressions where both addends are two-digit numbers; one addend is a multiple of 10 and the other is not. Students use and explain methods that make sense to them and show what they understand about what the two digits in a two-digit number represent (MP3, MP7).

  • Action and Expression
  • MLR8

Learning Goals

Teacher Facing

  • Add a two-digit number and a multiple of 10.

Student Facing

  • Sumemos decenas a números de dos dígitos.

Required Materials

Required Preparation

CCSS Standards

Lesson Timeline

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

Teacher Reflection Questions

What methods did your students use to add tens to two-digit numbers? Which methods surprised you, and which did you expect?

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