Academic Coaches – Math Meeting March 15, 2013 Beth Schefelker Bridget Schock Connie Laughlin Hank Kepner Kevin McLeod Multiplicative Thinking.

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Presentation transcript:

Academic Coaches – Math Meeting March 15, 2013 Beth Schefelker Bridget Schock Connie Laughlin Hank Kepner Kevin McLeod Multiplicative Thinking

Learning Intentions & Success Criteria Learning Intentions We are learning to understand common multiplication and division situations. Success Criteria We will be successful when we can recognize multiplication and division situations and represent them appropriately (visually and abstractly).

Multiplication Situations Work with a partner Read the problems. Draw a representation for each problem. How do your representations differ?

Problem Types Classify the problems as equal groups array/area or compare What is a useful model? Which problem type was the most difficult to find a model for?

OA K-5 Progressions Read page 22 of OA K-5 Progression document. Table Discussion: What are 2 important ideas that resonated with you?

CCSSM p. 89 Common multiplication and division situations Unknown ProductGroup Size Unknown (How many in each group? Division) Number of Groups Unknown (How many groups? Division) Equal Groups There are 3 bags with 6 plums in each bag. How many plums are there in all? If 18 plums are shared equally into 3 bags, then how many plums will be in each bag? If 18 plums are to be packed 6 to a bag, then how many bags are needed? Arrays, Area There are 3 rows of apples with 6 apples in each row. How many apples are there? If 18 apples are arranged into 3 equal rows, how many apples will be in each row? If 18 apples are arranged into equal rows of 6 apples, how many rows will there be? Compare A blue hat costs $6. A red hat costs 3 times as much as the blue hat. How much does the red hat cost? A red hat costs $18 and that is 3 times as much as a blue hat costs. How much does a blue hat cost? A red hat costs $18 and a blue hat costs $6. How many times as much does the red hat cost as the blue hat? General and

Tape Diagram Representation 8 pairs Beth Sharonda Beth has 8 pairs of dress shoes. Sharonda has 6 times as many pairs of dress shoes as Beth. How many pairs of dress shoes does Sharonda have?

Comparison Problem #1 Use tape diagram to represent the problem. Connie ran 50 meters and Bridget ran 6 times as far as Connie. How many meters did Bridget run?

Comparison Problem #2 Use tape diagram to represent the problem. Eratosthenes thought that the diameter of the earth was 8,000 miles and the distance from the earth to the moon is 9 times the earths diameter. How far did Eratosthenes think the earth was from the moon?

Comparison Problem #3 Use tape diagram to represent the problem. Bernard traveled 10 miles to a soccer game. The next day he traveled 4 times as far to another game. How many miles did Bernard travel for both trips?

Comparison Problem #4 Use tape diagram to represent the problem. Dylan has a collection of 150 matchbox cars and trucks. He has 4 times as many cars as trucks. How many cars does he have?

Unknown Factor Problems Rewrite each of the problems on your cards as unknown factor problems in two different ways. 3.OA. Understand properties of multiplication and the relationship between multiplication and division. 6. Understand division as an unknown-factor problem. For example, find by finding the number that makes 32 when multiplied by 8.

CCSSM p. 89 Common multiplication and division situations Unknown ProductGroup Size Unknown (How many in each group? Division) Number of Groups Unknown (How many groups? Division) Equal Groups There are 3 bags with 6 plums in each bag. How many plums are there in all? If 18 plums are shared equally into 3 bags, then how many plums will be in each bag? If 18 plums are to be packed 6 to a bag, then how many bags are needed? Arrays, Area There are 3 rows of apples with 6 apples in each row. How many apples are there? If 18 apples are arranged into 3 equal rows, how many apples will be in each row? If 18 apples are arranged into equal rows of 6 apples, how many rows will there be? Compare A blue hat costs $6. A red hat costs 3 times as much as the blue hat. How much does the red hat cost? A red hat costs $18 and that is 3 times as much as a blue hat costs. How much does a blue hat cost? A red hat costs $18 and a blue hat costs $6. How many times as much does the red hat cost as the blue hat? General and

Summarizing Our Work Operations and Algebraic Thinking Progressions Read p. 24 – 25 Stop at Levels in problem representation and solution Read p. 29 (first 2 paragraphs only) How did our work today on multiplication and division help clarify the ideas in the progression?

Learning Intentions & Success Criteria Learning Intentions We are learning to understand common multiplication and division situations. Success Criteria We will be successful when we can recognize multiplication and division situations and represent them appropriately (visually and abstractly).

Reflection Describe at least one way that youve deepened your understanding around the Common Core student expectations for multiplication and division.

Engage in a coaching conversation with your teachers around these ideas. Be prepared to share these experiences with your peers on April 12 th ACM meeting. Professional Practice