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Lesson Plan
Comparing Strategies for Three-Digit Addition
This lesson helps students develop an ability to compare and contrast as they explore two strategies to solve three-digit addition problems. This EL Math lesson can be used alone or alongside Three-Digit Addition Strategies Review.
Grade
Subject
View aligned standards
Objectives
Academic
Students will be able to solve three-digit addition problems using various visual and written strategies.
Language
Students will be able to compare and contrast two methods for solving three-digit addition problems using base-ten blocks and sentence frames for support.
Introduction
(4 minutes)
- Explain to the students that you are planning a very large dinner at a local community center. Say, "I've been collecting names of people that want to come to the dinner. I've already collected 135 names of people who want to come. My friend collected 102 names of people who want to come to the dinner. I need to plan how much food I need to buy, but I'm not really sure where to start. Turn and talk to a partner, sharing your idea."
- Provide sentence stems to support students in discussing their ideas, such as:
- I think you should add the numbers because ________.
- I think you should subtract the numbers because ________.
- Allow a few students to share their ideas aloud. Confirm that adding the two numbers is the correct answer because you want to figure out how many people are coming to the dinner in all. Elaborate that since we are combining the two numbers, this means we need to add them together.
- Tell the students that today they will compare and contrast two strategies to add three-digit numbers. Ask students to put their mathematician hats on!