Abstract
This is a binary mathematics lesson to reinforce the concepts of halves and the thirds. The new knowledge that third graders gain in the lesson is their introduction to the appropriate notation of halves and thirds with fractions. This is also the continuity between third and fifth grade. The lesson combines knowledge and skills in mathematics, Bulgarian language and literature, fine arts, technology, and entrepreneurship. The pre-project activity „The Half and the third“ gives a visual image of these concepts. Hands-on teamwork activities in a lesson are a great way to represent the concepts with real objects and a way to work with units of measurement that have been learned. Students should present what they have already learned about halves and thirds with a paper and cardboard presentation in the shape of flowers. They present drawn geometric shapes that are divided into two or three equal parts. In some of the shapes one of the two /three/ equal parts is colored. This is the problem situation – how to label this part in the presentation? The task of the fifth-grade teacher is to introduce fractions one-half and one-third of something whole through demonstration and with mathematical expression that is understandable to third graders. To show, explain and write down the fractions 1/2 and 1/3. The lesson ends with an emotional story about the symbolism of flowers by the school psychologist.
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