Yes they are you can make them your self or you can vist any school website that will have a list of fractions that each grade level should know then you can make them your self.
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They are not. If you make a serious effort to understand fractions, they are quite easy.
havefunteaching.com offers worksheets on sequencing. www.learningresources.com/text/pdf/2192book.pdf provides easy for children to understand worksheets on sequencing.
Long division worksheets are not difficult to understand if read clearly. There is not difference between the two worksheets you referenced. They are both easy to use.
There are plenty of math instruction websites that have worksheets and other practice materials accessible. One of the most popular is Math Aids, which has a comprehensive site that includes fraction worksheets. Biglearners.com is another great and free website for preschool-5 children. They have a very comprehensive and organized content as well (math - language arts).
Freemathdownload is a site to download free worksheets for the younger generation with things such as easy counting exercises. Great site for children up to ten years old.