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Grade 2 Monday, September 9, 2013 Children’s Strategies for Addi'on and Subtrac'on

Number Talks

A resource for growing children’s strategies: •  Number Talks: Helping Children Build Mental Math and Computa?on Strategies, Grades K-‐5

•  Author Sherry Parrish •  Math Solu?ons

•  Pub. 2010

Four Goals for K-‐2 Number Talks

1.  Developing number sense 2.  Developing fluency with small numbers

3.  Subi?zing 4.  Making tens

Classroom Clip: Ten-‐Frames and Dot Cards

1.  What ques?ons does the teacher pose to build understanding?

2.  What strategies are the students using to build meaning of the numbers?

3.  What examples of subi?zing, conserving number, and one-‐to-‐one correspondence do you no?ce?

4.  What opportuni?es are created for students to begin building an understanding of ten?

8 + 6

•  Grade 2

8 + 6

•  Doubles

6 + 6 = 12 12 + 2 = 14

8 + 6

•  Make 10

5 + 5 = 10 1 + 3 = 4 10 + 4 = 14

8 + 6

•  Relate to previous problem

6 + 7 = 13 so 6 + 8 = 14

8 + 6

•  Compensa?on to make doubles

Take one from 8 and add 1 to 6 to make 7 + 7 = 14.

8 + 6

•  What other strategies have you seen children use?

Ques?ons to consider:

•  How does the teacher build student fluency with small numbers?

•  What ques?ons does the teacher pose to build understanding?

•  How are the tools and models used to support the goals of the ac?vity?

•  What opportuni?es are created for the students to begin building an understanding of ten?

•  How does the teacher support student communica?on during the number talk?

Addi?onal Video

•  Author video •  Teacher video

3 categories of Number Talks

•  Category 1 – Introductory talks that encourage a specific strategy.

•  Category 2 – Crabed for students who are successfully using the selected strategy.

•  Category 3 – Provides opportuni?es to use and extend the targeted strategy.

•  What strategy do the next slides support?

Grade 2 Category 1

How do you think about the following?

9 + 9

Grade 2 Category 1

9 + 8

Grade 2 Category 1

9 + 10

Grade 2 Category 1

Doubles/Near-‐Doubles

9 + 9 9 + 8 9 + 10

Grade 2 Category 2

15 + 15

Grade 2 Category 2

16 + 16

Grade 2 Category 2

15 + 14

Grade 2 Category 2

15 + 16

Grade 2 Category 2


15 + 15

16 + 16 15 + 14 15 + 16

Grade 2 – Category 3


50 + 50



49 + 49



48 + 49



48 + 48



49 + 51



50 + 50 49 + 49 48 + 49 48 + 48 49 + 51


Category 1 Category 2 Category 3 9 + 9 15 + 15 50 + 50

9 + 8 16 + 16 49 + 49

9 + 10 15 + 14 48 + 49

15 + 16 48 + 48

49 + 51

Other Grade 2 Strategies

Addi?on •  Doubles/Near-‐Doubles •  Making Tens

•  Making Landmark or Friendly Numbers

•  Breaking Each Number into its Place Value

•  Compensa?on

•  Adding Up in Chunks

Subtrac?on Strategies

Subtrac?on •  Adding Up •  Removal

Available Dates in October

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7 8 9 10 11

14 15 K Nokomis

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28 9 30 31

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