How I Use It
This is a great game-based app focused on number sense. The format is very simple and intuitive, therefore students can use it with minimal up front training. Numbers League is very tightly focused on the concepts of addition and total value (and expands to multiplication in higher levels) and it does it well! Students use combinations of smaller numbers to make larger numbers that match various villains. Better than a worksheet and they'll stay with it for much longer. More advanced first graders could do the basic level games, but the more involved levels are more suited to 2nd/3rd or higher.
It has a superhero / graphic novel theme that is highly engaging for my students. It takes them beyond the typical rote fact practice and applies the knowledge with purpose in the game. There's only one way for kids to develop procedural fluency and speed in mathematics, and that's practice! Fortunately, there are different way to provide that practice, and this is a great one.
The app's purpose is quality practice and fluency, not corrective feedback or additional instruction - that's why I scored it low in the SUPPORT category. But that's not a criticism, it's a reflection of the design. Part of the reason it's so engaging is that it moves quickly.