There are LOTS of good apps available for smart phones and tablets that can help with math practice; here are a few free ones that I like. (Note that some of these free apps frequently suggest in-app purchases that can be a pain to get around.)
Splash Math Grade 2 Math (All around math skills. There are also other levels available. Learn more on their website: https://www.splashmath.com/apps/second-grade-math)
Sushi Monster (Fact fluency)
Motion Math Zoom (Number lines. *This one used to have a free version, but may only have a paid version now.)
Splash Math Grade 2 Math (All around math skills. There are also other levels available. Learn more on their website: https://www.splashmath.com/apps/second-grade-math)
Sushi Monster (Fact fluency)
Motion Math Zoom (Number lines. *This one used to have a free version, but may only have a paid version now.)