Numberblocks are great for children in the EYFS.
Nrich has problem solving ideas for children of all ages that they can solve independently and collaboratively.
White Rose Maths
Mathematics is a creative subject. It involves spotting patterns, making connections, and finding new ways of looking at things. Creative mathematicians play with ideas, draw pictures, have the courage to experiment and ask good questions.
Wild Maths is a collection of mathematical games, activities and stories, encouraging you to think creatively.