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Cool Math
Coolmath: Coolmath4kids: Printable Flash Cards
Find here flashcards for addition, subtraction, multiplication, and division for printing off and coloring.
Better Lesson
Better Lesson: To Divide Me Is to Multiply Me
Solving equations supports algebraic thinking which is needed for high school and beyond.
Books in the Classroom
Carol Hurst's Children's Literature Site: Computation and Picture Books
This sample chapter from Hurst's book Picturing Math is an excellent resource for using picture books and activities for learning computation.
University of Texas
Inside Mathematics: The Answer Is 36 [Pdf]
This task challenges a student to use knowledge of operations and their inverses to complete number sentences.