standard_description: Subtract multiples of 10 in the range 10-90 from multiples of 10 in the range 10-90 (positive or zero differences), using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used.
problem_activity: Stage 2: Numbers to 99 by 10
Required Preparation
Materials to Gather
Dry erase markers
Sheet protectors
Materials to Copy
Blackline Masters
Write the Number Stage 2 Gameboard

Narrative
Students count by 10 and choose whether to count forward or backward. Gameboards go from 3–93, 5–95, and 8–98.


aligns: no