GNOMIES LOVE MATH
https://xtramath.org/#/home/indexxtramath.org/#/home/index
($5 for the app but FREE on laptops and desktops. HIGHLY recommend.)
https://play.dreambox.com/play/login?requested_url=%2F (Highly recommend)
http://www.adaptedmind.com/First-Grade-Math-Worksheets-And-Exercises.html
http://www.mathgametime.com/grade/1st-grade
($5 for the app but FREE on laptops and desktops. HIGHLY recommend.)
https://play.dreambox.com/play/login?requested_url=%2F (Highly recommend)
http://www.adaptedmind.com/First-Grade-Math-Worksheets-And-Exercises.html
http://www.mathgametime.com/grade/1st-grade