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Common Core: Math
CCLS  Math: 2.NBT.9
 Category
 Number And Operations In Base Ten
 SubCategory
 Use Place Value Understanding And Properties Of Operations To Add And Subtract.
 State Standard:
 Explain why addition and subtraction strategies work, using place value and the properties of operations.3
44 Results

 Links to: G3–M2 Place Value and Problem Solving with Units of Measure Topic D focuses on the application of the tools and concepts presented in Topics A through C. Students synthesize their...

 Topic C builds upon Module 4’s groundwork, now decomposing tens and hundreds within 1,000 (2.NBT.7). In Lesson 13, students model decompositions with number disks on their place value charts while...

 Topic B in Module 5 is analogous to Topic B in Module 4, but while in Module 4 students composed ones and tens within 200, Module 5 expands upon this, finding students composing tens and hundreds...

 In Topic A, students practice the simplifying strategies they learned in Module 4, but with numbers up to 1,000. They will be asked to consider which strategy is most efficient for each problem they...

 Module 4 culminates with Topic F, in which students think about and discuss the multiple strategies they have learned to represent and solve addition and subtraction problems. They share their...

 Topic E begins with an extension of mental math strategies learned in first grade, when students learned to subtract from the ten by using number bonds. In Lesson 23, they return to this strategy to...

 In Lesson 17 of Topic D, students extend the base ten understanding developed in Topic A to numbers within 200. Having worked with manipulatives to compose 10 ones as 1 ten, students relate this to...

 Topic C parallels Topic B, as students apply their understanding of place value strategies to the subtraction algorithm, moving from concrete to pictorial to abstract. It is important to note that...

 In Topic B, students apply their understanding of place value strategies to the addition algorithm, moving from horizontal to vertical notation. Their understanding of vertical addition starts with...

 In Topic A, students build upon their understanding of the base ten system and their prior knowledge of place value strategies presented in Module 3. In Lesson 1, students relate 10 more and 10 less...

 Objective: Choose and explain solution strategies and record with a written addition or subtraction method.

 Objective: Choose and explain solution strategies and record with a written addition or subtraction method.

 Objective: Apply and explain alternate methods for subtracting from multiples of 100 and from numbers with zero in the tens place.

 Objective: Subtract from multiples of 100 and from numbers with zero in the tens place.

 Objective: Subtract from multiples of 100 and from numbers with zero in the tens place.

 Objective: Use math drawings to represent subtraction with up to two decompositions, relate drawings to the algorithm, and use addition to explain why the subtraction method works.

 Objective: Use math drawings to represent subtraction with up to two decompositions, relate drawings to the algorithm, and use addition to explain why the subtraction method works.

 Objective: Relate manipulative representations to the subtraction algorithm, and use addition to explain why the subtraction method works.

 Objective: Choose and explain solution strategies and record with a written addition method.

 Objective: Use math drawings to represent additions with up to two compositions and relate drawings to the addition algorithm.

 Objective: Use math drawings to represent additions with up to two compositions and relate drawings to the addition algorithm.

 Objective: Relate manipulative representations to the addition algorithm.

 Objective: Relate manipulative representations to the addition algorithm.

 Objective: Share and critique strategies for varied addition and subtraction problems within 1,000.