Adding Up In Chunks
Category 1 Category 2 Category 3
Breaking Each Number into its Place Value
Category 1 Category 2 Category 3
Compensation
Category 1 Category 2 Category 3
Doubles/Near-Doubles
Category 1 Category 2 Category 3
Making Landmark or Friendly Numbers
Category 1 Category 2 Category 3
Making Tens
Category 1 Category 2 Category 3
Subtraction: Adding it Up
Category 1 Category 2 Category 3
Subtraction: Removal
Category 1 Category 2 Category 3