One of the biggest dangers of grouping worksheets, is that when you change something on one worksheet, it is then applied to all of the worksheets that are grouped. While this can be considered a danger, it also can be used to ones advantage. Hope this helps.
any number
grouping
www.schoolsparks.com/kindergarten-worksheets is a good place to find worksheets. There are some free worksheets available to download and there is also a workbook of worksheets available for purchase.
I know that school worksheets dot com has some for you to review and checkout. That site allows you to search and download some free capitalization worksheets.
There are many different chiropractor worksheets. Some of these worksheets lay out care plans. There are also worksheets that have medical histories.
http://havefunteaching.com/worksheets/reading-worksheets/summarizing-worksheets/ has great summarizing worksheets available for you to use. it's easy to navigate through so you won't have any problem finding what you need.
There are many context clues worksheets. The company Worksheets For Everyone makes lots of free worksheets to download and use, they have many context clue ones.
Your son does not need to struggle because there are some great online sources for phonics worksheets. The best website for phonics worksheets is free-phonics-worksheets.com.
There are some great websites online such as MySchoolHouse.com that allow you to use online worksheets. You can also purchase textbooks full of worksheets.
Yes, you can find printable worksheets for children online. Two great websites for printable worksheets are tlsbooks.com and worksheetsforkids.net.
HomeSchoolMath.com allows you print worksheets by subject and grade level. Try this link for some 4th grade math worksheets: http://www.homeschoolmath.net/worksheets/grade_4.php
You can find some good measurement worksheets which should help you teach your 4th grade students all about measurements here at the following web address: www.education.com/worksheets/measurement/