Mrs. Wallaker's Math Site
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3.6 Subtraction Strategies by Trask
3.7 Subtraction Stories Practice by Trask
3.9 Practice With Subtraction Stories by Trask
3.9#1 Situation Equations by Trask
3.9#2 Addition and Subtraction Are Related by Trask
3.10, 3.11 Solving Mixed Problems
First Grade Math Expression Lessons