The Flex and Flo Package Mathematics 1 includes topic booklets on Calculating up to 10, Calculating up to 20, Geometry 1, Practical Math, and Sizes 1, as well as various supplements. There are tasks at three different levels. All tasks are self-explanatory and can be worked on individually. Stop signs at the end of some units guide the children independently to their diagnostic booklet, allowing you as a teacher to maintain an overview of the children's learning progress at any time during open initial instruction. The third generation of this popular teaching material also offers many advantages for teachers. With the proven stop sign principle, the learning progress of all children is always in view. Additionally, numerous improvements make the use of the booklets even easier now. The mathematics course includes continuous support for subject-specific language. New media are better integrated to strengthen children's media competence even in mathematics lessons and to facilitate the simple use of digital practice materials. Tips in the topic booklets for linking the booklets to each other and a minimal roadmap are valuable aids that significantly ease your flexible actions in the classroom and lesson preparation. The supplements of the Flex and Flo Package Mathematics 1 include: calculation strips, geometric shapes, play money, subject-specific vocabulary and phrases, and a learning clock.