In previous lessons, students related composing a ten and a hundred when adding within 1,000. They found sums that required composing one larger unit when adding by place. Throughout this lesson, the addends in each expression encourage students to consider adding by place. Both activities invite students to make sense of methods based on adding by place and to use the method that makes the most sense to them. Monitor for the different methods students use and how they use their understanding of place value to add and make sense of others' work (MP3, MP7).
- Action and Expression
- Add a two-digit number to a three-digit number using place value strategies that include composing units.
- Let’s compose tens and hundreds to add.
Materials to Gather
|Activity 1||20 min|
|Activity 2||15 min|
|Lesson Synthesis||10 min|
Teacher Reflection Questions
- Five in a Row: Addition and Subtraction (1–2), Stage 7: Add within 1,000 without Composing (Addressing)
- Number Puzzles: Addition and Subtraction (1–4), Stage 4: Within 100 with Composing (Supporting)
Print Formatted Materials
For access, consult one of our IM Certified Partners.