Description
Topic C focuses on addition and subtraction of tens (1.NBT.4, 1.NBT.6). Having used concrete models in Topic A to represent 10 more and 10 less, students now recognize that just as 3 + 1 = 4, 3 tens + 1 ten = 4 tens. With this understanding, students add and subtract a multiple of 10 from another multiple of 10.
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Credits
From EngageNY.org of the New York State Education Department. Grade 1 Mathematics Module 4, Topic C.
Available from engageny.org/resource/grade-1-mathematics-module-4-topic-c; accessed 2015-05-29.
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