Objective: Add a pair of two-digit numbers when the ones digits have a sum greater than 10 using decomposition.
Lessons 13 and 14 focus on the most challenging addition work of this grade level, as students add a pair of two-digit numbers when the ones digits have a sum greater than 10, using the same number bond work as Lesson 8, as shown to the right (1.NBT.4)
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From EngageNY.org of the New York State Education Department. Grade 1 Mathematics Module 6, Topic C, Lesson 13.
Available from engageny.org/resource/grade-1-mathematics-module-6-topic-c-lesson-13; accessed 2015-05-29.
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