Let your child play the Friends of 10 game and he or she will gain some basic maths knowledge.

Friends of 10 (0+10, 1+9, 2+8, 3+7 etc) is a concept to teach kids basic maths. The goal is to reach an understanding of the relationship between numbers. By playing this game again and again the child will get to know the relationships by heart and thereby it will soon be able to manage also more complicated calculations.

You get one point for each correct answer and trying to reach a good score keeps the kid motivated to continue the math training for a long time.

http://appshopper.com/games/friends-of-10