Definitely agree with RosemaryandThyme, that investing in reading is much much more valuable at this stage. I would never pay for Kumon classes as I don't think they offer anything over what you can do with your child at home using their workbooks (apart from more travel time and less time to do other activities!). You also have to recognise that they don't teach maths as such, but make kids good at a narrow range of types of sums by endless repetition. My dd is in year 1. My dh likes them and does bits and pieces at home with her. Her mental arithmetic is very good with number bonds up to 20, she can confidently add and subtract 2 digit numbers, and knows most of her 2,3,4,5,10 times tables but I STILL wouldn't confuse this with being good at maths or being able to problem solve or work things out from first principles. If you use them, I think you have t recognise their limitations and whether you could spend the time more usefully doing something else.