Kumon has Junior Kumon which may be good for your kiddo. But when your kiddo starts getting to 2nd grade level, I would recommend something else like Khan Academy, IXL or even study island or ten marks.
Kumon has a lot of gaps when you compare with the school curriculum (2nd grade onwards) and a lot of repetition will bore your kiddo.
But as Jack's mom said, you can buy and use flashcards for addition and subtraction and work sheets from internet. It will be a lot cheaper than >$100/month fee at Kumon.
