Free worksheets available for all books in the series: addition/subtraction, multiplication/division, fractions/decimals, percents/ratios, pre-algebra/algebra, and geometry
Curriki, the online education community, is building the first website to offer free, open-source instructional materials for K-12. We have thousands of free worksheets, lesson plans, exams, project ideas and activities for English language arts, math, science, social studies, technology integration and other subjects. All of our educational material is contributed by teachers and partners and is free and open source.
A vast, unmissable science resource site with something for anyone. Find worksheets, flash resources, lesson plans and much more.
http://ictmagic.wikispaces.com/Science
This is a superb site with thousands of well designed cross curricular activities, whiteboard resources and videos to use in your class. Best of all, it is free for teachers.
http://ictmagic.wikispaces.com/Cross+Curricular