Here's a website that correlates with your child's Math book. Just click on the website below, then click on Math and then Students Grade One. Lots of activities on this site including games with math facts.
http://www.sadlier-oxford.com
Here is a website that helps your child learn math fact families.
http://www.mathcats.com/explore/factfamilies/printaddcards.html
Here is a website where your child plays a timed game and answers addition and subtraction facts. Great for practice when working with your flash cards.
http://www.oswego.org/ocsd-web/games/mathmagician/maths1.html