Fun Brain is a cool website for students from different grades. Fun Brain offers games and puzzels covering different categories.There are Math games ( such as Night Swimmers, Math baseball, Mummy Hunt etc ), Word games such as The Plural Girls, Scramble-Saurus, Spell Check, Stay Afloat etc ), Matching games ( like Brain break, Fun Match, Burried Memories, Guess the colour etc), Puzzels ( like Sudoku, Word Turtle, Puzzler etc), and Just for Fun games ( such as Mighty Guy, Water Bug, Penguin Drop etc ). These are the main sections of the website but you will also find reading materials for kids together with some video illustrations.
You can browse the games according to the grade , it starts from Kindergarten to grade 8. Fun Brain does not require any registration so far and it is very student friendly. No distractive ads or popping up windows. I do recommend it for teachers.
Head over to Fun Brain to explore more.