Beginner

 

Count/Non-count Nouns

English for Everyone

http://www.englishforeveryone.org/Topics/Count-and-Non-Count.htm

A series of worksheets to practice

English for Everyone count and non count noun worksheetsCouConCC

http://www.englishforeveryone.org/Topics/Count-and-Non-Count.htm

Worksheets for basic count and non-count identification as well as few/little andtoo/very

ESL Library

https://esllibrary.com/courses/88/lessons/2028

Multi-level

 

Grammar Quizzes

http://www.grammar-quizzes.com/articlesum.html

Fairly advanced site with explanation and online exercises.

OWL 

https://owl.purdue.edu/owl/general_writing/grammar/using_articles.html

Very comprehensive explanation of using articles.

https://owl.purdue.edu/owl/general_writing/grammar/count_and_noncount_nouns/count_noncount_nouns_with_articles_adjectives.html

Same site as above, focusing on count/non-count

 

Using English

https://www.usingenglish.com/quizzes/#Articles

Online quizzes, with an option to print in handout format.  Nice supplement.  

 

Commnet count and non-count nouns

https://guidetogrammar.org/grammar/noncount.htm

Great explanations, although a little advanced, with quizzes at the end