Flex and Flo open. Flexible. Safe. Flexible and open. Flex and Flo is a modern teaching resource for open, flexible mathematics instruction, suitable for both grade-specific classes and cross-grade learning groups. The four thematic workbooks per school year enable independent work and learning in individual ways and at one's own pace – fostering differentiated mathematics instruction. Competency-oriented and clearly structured, Flex and Flo ensures that the required learning objectives and competencies are met for every child. The thematic workbooks are clearly structured in content, encouraging children to make independent mathematical discoveries. The friendly characters Flex and Flo assist in articulating discoveries through systematic support. Open and rich tasks consistently provide opportunities for working at an individual level.