In previous lessons, students used their understanding of place value to add and subtract within 100 by composing and decomposing tens. Students learned that a hundred is a unit that is composed of 10 tens and composed and decomposed hundreds to name the values of base-ten blocks.
In this lesson, the number choices and the use of base-ten blocks encourage students to look for ways to add by place and to anticipate where composing a unit might be needed before adding (MP7).
Activity 2: Walk About and Add
- Add numbers within 1,000 using place value strategies that include composing a ten or hundred.
- Let’s add three-digit numbers and compose tens or hundreds.
Materials to Gather
Materials to Copy
- Walk About and Add Cards
- Create a set of cards from the blackline master so that each student will receive 1 card.
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
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