Activity
Cool Math

Coolmath: Coolmath4kids: Printable Flash Cards

For Students K - 1st
Find here flashcards for addition, subtraction, multiplication, and division for printing off and coloring.
Lesson Plan
Better Lesson

Better Lesson: To Divide Me Is to Multiply Me

For Teachers 6th Standards
Solving equations supports algebraic thinking which is needed for high school and beyond.
Professional Doc
Books in the Classroom

Carol Hurst's Children's Literature Site: Computation and Picture Books

For Teachers Pre-K - 1st Standards
This sample chapter from Hurst's book Picturing Math is an excellent resource for using picture books and activities for learning computation.
Lesson Plan
University of Texas

Inside Mathematics: The Answer Is 36 [Pdf]

For Teachers 2nd - 4th Standards
This task challenges a student to use knowledge of operations and their inverses to complete number sentences.