You can find free math worksheets on the website such as softschool.com, mathisfun.com, homeschoolmath.net. From your local book store, you can also find math addition worksheets.
There are several good websites that provide printable addition worksheets. Try APlusMath.com. They allow you to print customized addition worksheets.
There are plenty of resources on the internet that provide you with times tables worksheets. Websites such as: happychild.org, teachingimage.com, worksheetlibrary.com, and triggermemorysystem.com, will provide you with a ton of different worksheets to choose from.
You can find chemistry worksheets online on websites such as Khan Academy, ChemCollective, or Teachnology. Some educational publishers also offer chemistry worksheets as part of their curricula or as supplemental materials for purchase. Additionally, many teachers and schools provide worksheets on their websites or through online learning platforms.
You should not have to pay for math worksheets. Two free websites that offer math worksheets are mathscore.com and mathworksheetwizard.com.
I found a couple of sites for you to look at about line worksheets. Here are the sites I found for you to look at themathworksheetsite.com/numline.html , and www.tlsbooks.com/mathworksheets.htm
There are many places online where you can find free addition worksheets, and also customize them for your child. For example, http://www.homeschoolmath.net/worksheets/addition.php and http://www.mathsisfun.com/worksheets/addition.php.
The best place to get kindergarten addition worksheets to help the students better understand the math questions is at math addition dot com. Good source of worksheets.
If you have access to a printer, you can download and print some ABC worksheets at many websites. Abcteach.com, tisbooks.com and kidslearningstation.com are just three of many websites that offer the worksheets you are looking for.
When you go into Google and search "chemistry worksheets" there are a slew of websites that come up which provide free chemistry worksheets. If you want to get more specific as to which age group of kids you will be teaching, then you have to add the grade level to your search.
There are many good websites to find printable math worksheets of kindergarteners, but www.mathblaster.com is the best. They have many free printable worksheets that you can print out for your kindergarteners.
Worksheets are a great way to teach a lesson plan to kids, especially at the elementary school level. There are tons of websites that offer worksheets that you can download and print right from your computer. Check out www.superteacherworksheets.com or www.teach-nology.com/worksheets/ for starters.
In researching Algebraic Expression Worksheets, I have come across a number of websites that provide what you are looking for. You can find some on ezschool dot com as well as on math-drills dot com.