Topic C builds upon Module 4’s groundwork, which is now decomposing tens and hundreds within 1,000 (2.NBT.7). In Lesson 13, students model decompositions with place value disks on their place value charts while simultaneously recording these changes in the vertical form.
In Lessons 14 and 15, students transition into creating math drawings, thus completing the move from concrete to pictorial representations.
Lessons 16 and 17 focus on the special case of subtracting from multiples of 100 and numbers with zero in the tens place.
In Lesson 18, students work with three-digit subtraction problems, applying multiple strategies to solve. As students apply alternate methods, the emphasis is placed on students explaining and critiquing various strategies.
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