Teaching math by rote will lead to math frustration later on. Children need "strategies" to understand math. Before children learn their math facts to 10 they need to learn about 5 first and how it is special. (five fingers, toes , your can see five without counting:one in the middle)
Teach this song by Dr Joan Cotter (RightStart mathmatics) using your two hands to show.
Yellow is the sun
six is five and one
why's the sky so blue
seven is five and two
salty is the sea
eight is five and three
hear the thunder roar
nine is five and four
ducks will swim and dive
ten is five and five
I would highly recommend that you purchase Dr. Cotter's abacus. The abacus has 5 blue beads and 5 yellow beads on each of the 10 rows. Children can see six is 5 and 1 because there is 5 blue and 1 yellow, seven is 5 and 2 because there is 5 blue and 2 yellow, etc.
Once this is established you can now move into strategies to help your child actually understand rather than memorize the facts. 4 and 6 is 10 because when you take one from the six and give it to the 4 you have 5 and 5. 3 and 7 is 10 because you need 2 from the 7 to make a five and again 5 and 5 is 10. Using the abacus to show this gives a powerful visual as well as a highly effective manipulative to "see" the fact.