Hundreds arithmetic frame made of natural material RE-Wood® with 100 balls.
The red and blue balls are arranged in a structure of 5.
- Addition - adding with and without passing tens
- Multiplication - multiply
- division - dividing - distributing
- Comparison of numbers (more-fewer)
- Discovering relationships between numbers
- Using technical terms (e.g., predecessor/successor, neighboring tens/neighboring hundreds, half/double of, multiple/divisor of)
- Emphasizing the 5's and 10's structure