Adding Multidigit Numbers

Est. Class Sessions: 2–3

Summarizing the Lesson

After students have had time to solve the Shark Day problems, display the Addition Strategies Menu from the Student Activity Book Reference section.

Ask:

Did anyone use one of these paper-and-pencil strategies to solve a Shark Day problem? Show us.
Did anyone use a mental math strategy to solve one of the problems? Show us.
The example problems on the menu add smaller 2-digit numbers, but can you use these strategies when you are adding these larger numbers? (yes)

Tell students to take out the My Own Addition Strategies Menu page in the Student Activity Book. Explain that they will fill in this blank menu with a variety of solutions to an addition problem with larger numbers, 675 + 526. Students will work with a partner to complete the page. Instruct them to refer to the Addition Strategies Menu in the Student Activity Book Reference section as they work. Encourage students to refer to this completed menu as they solve problems in future lessons.

Use the My Own Addition Strategies Menu page in the Student Activity Book to assess students' progress toward adding multidigit numbers using mental math strategies (e.g., composing and decomposing numbers, counting) with base-ten pieces and number lines [E6]; adding multidigit numbers using paper-and-pencil methods (e.g., expanded form, all-partials, compact) [E7]; checking calculations by solving problems another way [MPE4]; and showing work [MPE5].

Adventure Book:

Student Activity Book: 739

Answers