Check out these websites for great
mostly free to print elementary grades K-5
instructional worksheets and materials.
Reading/Language
Arts
Motivational free materials for the beginning reader: vowel posters, alphabet worksheets, and easy to read book pages. Grades K-2. http://www.beginningreading.com/Free%20Workshe.htm
Scroll down to see
the wide variety of free simple line graphic organizers to use when teaching
reading and content concepts.
Grades 1-5
http://www.teach-nology.com/worksheets/graphic/
Good website for
colorful motivational free activity sheets for teaching handwriting skills for the
primary grades and cursive writing for the intermediate grades; Small number of
free worksheets to choose from. The workbooks are available for purchase. Grades K-3.
http://www.handwritinghelpforkids.com/worksheets.html
Activities: Great free printable materials
to accompany her books, such as hedgehog masks, paper dolls, etc. There is a wide variety of general
materials as well: alphabet coloring pages, calendars, certificates, drawing
guides, flashcards, and much, much more.
Grades K-3. http://www.janbrett.com/activities_pages.htm
Mathematics 
Scroll down to find the
great free
mathematics charts: number, addition, multiplication. It also has printable holiday
craft ideas.
http://www.activitiesforkids.com/teacher.htm
Colorful and
motivational free worksheets available on a wide variety of mathematical
concepts: operations, money, time, facts, fractions, etc. The worksheets for other content
areas are nice but not as well labeled, making it more time consuming to use.
http://www.schoolexpress.com/fws/cat.php?id=2252
Basic mathematics free computation worksheets
(addition, subtraction, multiplication and division); includes answer keys
too. They have more available
for a fee.
http://www.sssoftware.com/freeworksheets/index.html
Science
Mainly free word finds, but a few
informational sheets Topics such as beginning science, space, desert, and
animals. Grades K-5.
http://www.tlsbooks.com/scienceworksheets.htm
Free quiz worksheets on a variety of topics: senses, living things, magnets, etc. ; categorized by grade level, 3-6. It also has reading and mathematics materials. http://www.tut-world.com/
Social Studies 
Has motivational geography
(map skills, state and world flags), inventor, explorer worksheets: etc. A great website with a multitude of
worksheets available for other content areas too. The one drawback is that there is a
$20.00 yearly membership fee to print materials.
http://www.enchantedlearning.com/geography/
National
Geographic website has printable free country and world
maps, to use as resources in your classroom.
http://java.nationalgeographic.com/studentatlas/printpdf.html?
General
A toZ Teacher Stuff A
great website with a large number of free worksheets to download in theme related areas, i.e.:
Back to School, Month, 100 days, and by content area (reading and
mathematics). Grade level
categories K, 1-2 and 3-5.
http://www.atozteacherstuff.com/Printables/index.shtml
ABC Teach Has great free motivational extra
teacher materials such as book marks, student awards, name tags, desk tags,
etc.
http://www.abcteach.com/directory/teaching_extras/