Grade 1 Mathematics Module 1, Topic B

boy doing experiment

As students move into Topic B, they gain momentum with putting together, composing and decomposing, and counting on to determine the total. Students use both concrete and pictorial situations to describe all of the decompositions of 6, 7, 8, 9, and 10 (1.OA.5). Lesson 4 begins with six children posed at the front of the class. They will be put together in different ways to show the various combinations of 6, such as 2 boys–4 girls and 3 wearing long sleeves–3 wearing short sleeves. During this process, the put together situation will be highlighted, engaging students in counting on from one addend, or part, to find the total (1.OA.1, 1.OA.5). As students progress through the lesson, they come to see that 6 is constructed of several different decompositions, by using 2-color counters and recording the decomposition in number bonds and as expressions (1.OA.1). They record each decomposition of 6, and reflect upon all of these number partners, “Look at all these ways to make 6! I can see connections between them!” Lessons 5, 6, 7, and 8 continue this same process of putting together, composing and decomposing. In Lesson 5, students

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Common Core Learning Standards

CCLS State Standard
1.OA.1 Use addition and subtraction within 20 to solve word problems involving situations of adding to,...
1.OA.5 Relate counting to addition and subtraction (e.g., by counting on 2 to add 2).
1.OA.6 Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use...

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