Free app.  Geoboard is a virtual manipulative tool learners use for exploring a variety of mathematical topics.  Learners stretch rubber bands to form line segments and polygons to make discoveries about perimeter, area, angles, congruence, fractions and more. 

$2.99  Math Duel is a split screen mathematics game that pits two players against each other on the same device! Change settings for each player to level the playing field.  New single player mode is great for fun math practice.  Great way to differentiate and work on personal math goals.  All kids can partner up.

Best for grades 3-6.
 

FEATURES: Children can choose different game modes for a personalized and interactive learning experience, while teachers can monitor progress and cusomize settings.  Features include:

• Daily Adventures: set child's level for 10-15 minutes of daily practice
• Missions: 60+ math concepts covered for pre-K to 2nd grade
• Play-based Monster Quizzes to reinforce learning- with monsters kids can collect
• Accessibility options: left-handed mode, Open Dyslexic font options, help button, simplified keypad input style