To perform one function that will work on all the sheets.
right-click on the sheet tab and click: select all worksheets.
If worksheets are in one line, then hold SHIFT and click on one end and then the other end, if not in order, then hold CTRL and click on the worksheets you want to group.
I have found a number of sites that offer free multiplication worksheets. These sites offer worksheets for different age groups. You might want to check out softschools dot com and superteacherworksheets dot com for some of these worksheets.
any number
I have researched long division worksheets for you and found a number of sites that have both downloadable and printable worksheets. A few sites you might want to have a look at are superteacherworksheets dot com as well as mathisfun dot com.
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.
workbook
If you want practice worksheets for high school students , just go to http://havefunteaching.com/worksheets/english-worksheets/alphabetical-order-worksheets/. Once there just select the worksheets wanted.
Group
In order to group nonadjacent worksheets, you click first tab, then hold Ctrl and click last tab. Excel was developed by Microsoft.
I have seen free geometry worksheets on ebay. They only caviat is that you might have to pay a nominal fee for shipping if buying printed worksheets to send.
If you want worksheets for kindergarden, one could easily get them free on the internet. Printable version of worksheets can be found on mathblaster, kidzone, schoolsparks or educational websites.
I'm not really sure what worksheets you mean because I can't see any, but usually worksheets often help children learn as long as it's for their age group.