Simple games can give you some good quality time with your child and help build their confidence in their math skills. Have your child bounce a ball for each number in a math fact, for example bouncing a ball 3 times, and then 5 times for the math fact 3 plus 5. Variations include you bouncing the ball and not saying the number, them having to cound the bounces, and tell you the math fact. Play bingo, with the math facts that add up to numbers on their cards. This can be used with any number of children, and if you have small prizes for a 'bingo' would make a great party game.
Older children can have multiplication facts only.
You will need to have the cards ready ahead of time, but once made can be reused over and over. Time them and see if they can go faster. This will also work with multiplication. With more than one child you can let them race against each other. Tell a story with math facts in it.