Montessori 1st Operations - addition & subtraction made simple

An Amazing app dedicated to the discovery of additions & subtractions, for children 5 to 8 years! - Featured in iTunes! Want to build a solid math foundation for your children? 
 Montessori 1st Operations is a revolutionary app allying a 100 year old proven pedagogy with the best of 21st Century technology and fun monsters to introduce 4 very important concepts (addition, subtraction, doubles…