Khan Academy
Khan Academy: Multiplying & Dividing Negative Numbers Word Problems
Practice matching situations to multiplication and division expressions and equations. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Teachnology
Teachnology: Math Lesson Plans
Great lesson plans covering a wide-range of math-related subjects.
Homeschool Math
Homeschool Math: Dividing Fractions: Using the Shortcut
In this lesson, learn how to divide fractions using the shortcut of reciprocal numbers which is shown in the accompanying video. [10:31] The lesson also includes practice problems and many word problems.
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.
Homeschool Math
Homeschool Math: Multiply and Divide Decimals by 10, 100, and 1000
Lesson includes a video & examples showing the common shortcut for multiplying & dividing decimals by powers of ten. [7:59] Provides exercises and word problems for practice.