It is easy and can even save your child the trouble of lugging around heavy books.
For science just click this link: http://activities.macmillanmh.com/science/ca/
Just click on the book cover for fourth grade. This will lead you to all sorts of activities to help your child learn more about their current science lessons.
In order to view the actual textbook just click on this link and enter the login info found below: http://www.glencoe.com/sites/common_assets/science/ose/
Username: casci04
Password: redwood
For Social Science it is just as easy.
Click on this link: http://mhln.com/UnregisterController?ACTION=POST&MANAGER=LOGON&OPERATION=LOGON&JSP=index.jsp
Simply click on the " For Students" tab (on the left side) and enter our class code: Owen2007
You will get a list of the textbooks in grade order. Just click on fourth grade.
Both of these sites have games and extra resources to help your children expand there knowledge in the sciences. How great is it to live in this day and age where your child's books can be found on your computer. My back still hurts from carrying all of my books around as a youth.
Please comment to this post and let us know how this resource has been helpful for your family.