In a previous lesson, students subtracted from a three-digit number using place value strategies that included decomposing a ten.
In this lesson, students interpret representations of subtraction that show decomposing a ten and hundred. They use base-ten blocks and their understanding of place value to explain why the method works (MP7). Students may continue to use the base-ten blocks or any representation that makes sense to them to subtract within 1,000.
- Action and Expression
- Subtract numbers within 1,000 using place value strategies that include decomposing a ten or hundred.
- Descompongamos una decena o una centena para restar.
Materials to Gather
|Activity 1||15 min|
|Activity 2||20 min|
|Lesson Synthesis||10 min|
Teacher Reflection Questions
- How Close? (1–5), Stage 4: Add to 1,000 (Addressing)
- Five in a Row: Addition and Subtraction (1–2), Stage 8: Add within 1,000 with Composing (Addressing)