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Are you using Interactive Math Notebooks this year? Use this mental math addition strategies lesson as a part of your math notebook. It includes 6 different strategies to add numbers within 100, as well as a reflection with 5 choices of ways to reflect and a rubric for self-evaluation.
This meets Common Core Math Standards: 2.OA.B.2. It also meets the UK National Curriculum Maths Programme standards for Year 2, Year 3 and Year 4.