standard_description: Understand subtraction as an unknown-addend problem. For example, subtract 10 – 8 by finding the number that makes 10 when added to 8.
problem_activity: Stage 2: Factors 1–5
Required Preparation
Materials to Gather
Colored pencils, crayons, or markers
Number cubes
Paper clips
Materials to Copy
Blackline Masters
Rectangle Rumble Stage 2 Grid
Rectangle Rumble Stage 2 Spinner

Narrative
Students generate factors with a number cube and a spinner with the numbers 1–5. Students use a
\(15 \times 15\)
grid.
Additional Information
Each group of students need a paper clip, a number cube, and two different color writing utensils.


aligns: no