Here is a great resource to help you reinforce what you are teaching in math.   SoftSchools.com is chock full of fun math games and math worksheets.  They also breaks the games down into categories by grade.  Here I will hightlight just a few that we've enjoyed.

Remember, depending on the curriculum you are using, some games may be too advanced (even if they are a grade or two lower) and others in a particular grade may be too advanced. I don't know how they have determined their grade categories. So be sure to check out the game before your child to be sure they have learned the skills, this will help you avoid frustration or discouragement.

Solve for the Unknown:
Math Lines, Add to 5, 6, 7, 8, 9, or 10
You are given a number on a ball.  Shoot the ball at the number that, when added together, will equal your target number.  I've linked you up to "add to 10."   In the example to the left, the ball in the shooter is number 3, shoot it at the number 7 to equal 10.  Earn points and advance through levels. 

All of the line games are at the top of the page, give them a try!
Read more to explore a few other games.

Here is a great resource for those of you who want to know what your children should be learning and when. It is a great resource if you would like to put your own curriculum together.

"Home Learning Year by Year" by Rebecca Rupp.
From the Publisher:

The integral subjects to be covered within each grade
Standards for knowledge that should be acquired by your child at each level
Recommended books to use as texts for every subject
Guidelines for the importance of each topic: which knowledge is essential and which is best for more expansive study based on your child's personal interests
Suggestions for how to sensitively approach less academic subjects, such as sex education and physical fitness

We've been working with Math manipulatives and working with a great Math program called Singapore Math.

I am loving Singapore Math so far, they focus on using concrete concepts first (manipulatives) followed by pictorial representations (Text book, counting and picture problems) and finally abstract symbols (actual numbers.)

These are photos of Madison's turn, Lydia had already completed "the game" and she was trying soooo hard not to answer the problems!

More practice with Singapore Math. I altered one of the games, here the girls each have a stack of cards 0-10. I shuffled them and set aside 4 random cards in each set. Then gave the remaining cards to the girls. They each had to figure out which numbers were missing and write it on their board. Once they think they are done, I then display the 4 cards I removed and they can check their work. They had a lot of fun with this one and kept asking me to "do it again!"

Using Math Manipulatives to learn addition for the first time.
We are using the "See & Solve Manipulative Kit"

Note: We've since been using a math curriculum called Singapore Math... this manipulative kit is the perfect thing for this program... but you could use whatever you have on hand, beads, buttons, etc. Have fun!

Penny, Nickle, Dime and Quarter
We talked about each coin, what it's name was, discussed the differences in sizes and the value of each.

We placed a sticky on the table with the different number values of each coin. I put the stickies in order and showed how the coins matched the number value.

Then I mixed up the coins and had her match the coin on the sticky. After she did that right a few times, then I started to mix up the stickies. It was a fun game. After 15 to 20 minutes she had them right every time. Try it again in a few days until they are right each time you play.

If your child is able to read, you might write the names of each coin on a sticky too.