This site has lessons to read through on math topics, and an opportunity to practice facts. www.figurethis.org
This site, from NCTM, has challenge questions for kids to solve.
This site has many math fact games. Many require a bit of skill with keyboard commands and an ability to follow directions.
Although this is a subscription site, some fact games can be played for free.
This website generates fact practice worksheets according to your specifications. It is easy to use. Worksheets can be made for time and money as well.
Additional websites that offer fact practice can be found by searching for “Math Fact Practice” on your favorite search engine. There are many more sites to try.