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Lesson objective: Decompose numbers within 5 to understand subtraction as "take apart".
This lesson helps to build procedural skill by decomposing totals into number partners. Number bonds and five frames are used here because they support student organization as they discover these pairs. This work develops students' understanding that subtraction can be experienced as the action of taking apart a total.
Students engage in Mathematical Practice 2 (Reason abstractly and quantitatively) as they reason about the relationship of the total and the quantity of each group (pennies up and pennies down).
Key vocabulary:
- five frame
- number bond
- penny
- subtraction
- take apart
- total
Special materials needed:
- five frame board
- number bond board
- pennies
- record sheet (or other tool to record thinking)
- small containers for pennies