I like to keep much of our early mathematical skills as hands-on as possible. If an area will need to be drilled over and over again until mastery is achieved, then it is far more interesting for my children to do that using Montessori style tray activities rather than repetitive book work. Learning addition and subtraction facts, multiplication tables and the like are great examples of this. Lots of work is necessary, but it need not be all written bookwork.
This week my 6-year-old son needed to polish up on his skip counting. I pulled out some plastic Easter eggs and wrote the 2, 5 and 10’s on each hump of the caterpillar, poking a pipecleaner through the first one to make the caterpillar’s head. He placed each in order and recited them to me once finished. Next time I will remove a couple and get him to say them (including the missing numbers) until he can eventually say them all without any numbers as prompting.