I have a very bright and keen year 2 child who loves maths. He particularly likes arithmetic. Any ideas for books for him? Most maths book have a variety of things and are quite wordy, and he really wants to do lots of pure maths. (We do other kinds of maths on the Doodle maths app).
I have ordered some kumon books, but these aren't easy to find, and I am wondering if there are any others. For ideas of level, he is doing column addition/subtraction, problems involving negative numbers, fractions, multiplication etc.