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Extending Computational Fluency with Larger Numbers- Additio

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by

Tamara DeYoung

on 17 February 2015

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Transcript of Extending Computational Fluency with Larger Numbers- Additio

Mental Computation
Research
Addition and Subtraction Strategies for Larger Numbers
Algorithms for Subtraction
Algorithms for Addition
Extending Computational Fluency with Larger Numbers
Addition and Subtraction
Traditional- Regrouping, renaming, trading up








Expanded-






Low Stress-

1

48
+ 67
115

40+8
60+7
100+15=115
48
+67
100
15
115
Fluency is more than memorizing computational rules or learning key words, it includes estimation, number sense, and thinking about the reasonableness of computed answers. p.251
Traditional- Decomposition/ Regrouping



Expanded-






573
-385
188




4 16 13
400 + 160 + 13
- 300 - 80 - 5
100 + 80 + 8

678+1= 679
-199+1= -200
479
Equal Additions-
Compensation
Students adjust the original addends to simplify the addition
Alternative Algorithms
Full transcript