standard_description: Decompose numbers less than or equal to 10 into pairs in more than one way, e.g., by using objects or drawings, and record each decomposition by a drawing or equation (e.g., 5 = 2 + 3 and 5 = 4 + 1).
problem_activity: Stage 1: Objects
Required Preparation
Materials to Gather
Connecting cubes
Materials to Copy
Blackline Masters
Number Mat 1–5

Narrative
One partner builds a tower with 5–10 cubes. The other partner rolls a cube onto the number mat to figure out how many cubes to subtract. Students work together to figure out how many cubes are left.


aligns: no