This is the main body of the lesson. Students are working whole group, small group, at stations or individually. This depends on your learning intentions for the lesson.
Individual or partner work – puzzles, games, problems and manipulatives. This site leads to one of my all time favourite manipulatives.
http://www.hand2mind.com/category/math/cuisenaire-rods/3081
Group work – problem solving on vertical, non permanent surfaces – https://www.edutopia.org/article/building-thinking-classroom-math
Work Stations – manipulatives, games, technology, vocabulary, teacher