Out of the 70 books, 37 are comic books. How many are not comic books? ... How many are not comic books? How would you explain why you
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DeAnn Huinker & Beth Schefelker
April 27, 2010
Strengthening the ability to move between and among representations improves the growth of children’s conceptual understanding.
Vandewalle, J. Elementary and Middle School Mathematics Teaching Developmentally. Pearson Education, 2007.
A model for thinking about a mathematical concept refers to any object, picture, or drawing that represents the concept.
The book cart has an assortment of things to read for
indoor recess. Out of the 70 books, 37 are comic books.
How many are not comic books?
Solve it (no standard algorithms allowed). Then turn & share.
23 + 40
67 + 20
B. Bridging to 10
7 + 8
38 + 5
C. Jump Strategy
46 – 39
72 – 51
D. Compensation Strategy
45 – 29
57 + 39Try the strategies in the article
Each person selects one strategy. Practice it. Use an empty number line, if appropriate. Then teach it to your table partners.
E. Split Strategy
What connections are you finding to the strategies we have explored and discussed in class?
How would you explain why you “add” the 1?
25 + 10 + 5 + 2
25 + 5 + 10 + 2
How does Sam use his understanding of
number and relationships as he works on the
How does Grant approach solving…
25 + 37
How did the model help Grant explain his thinking?