Description: In Topic A, students practice the simplifying strategies they learned in Module 4 but with numbers up to 1,000. They are asked to consider which strategy is most efficient for each problem they encounter. In Lesson 1, students relate 100 more, 100 less, 10 more, and 10 less to addition and subtraction. In Lesson 2, students add and subtract multiples of 100 by counting on by hundreds. For example, when adding 200 to 320, they may count up from 320: 420, 520. In Lessons 3 and 4, students continue to add and subtract multiples of 100 with the added complexity of some tens. Lesson 3 focuses on addition, while Lesson 4 emphasizes related strategies for subtraction. In Lesson 5, students apply the use of number bonds to decompose larger numbers, just as they did with numbers within 100. In Lesson 6, the ease of subtracting a multiple of 100 is highlighted again as students extend their work from Module 4 using compensation (i.e., the associative property) for subtraction. Topic A closes with Lesson 7, which provides students the opportunity to solidify their new skills.

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