Maths challenge Android Game

The description of Maths challenge: Put your mathematical abilities and short term memory to the test with this maths challenge app.The game starts with a randomly generated number and then you have to apply a series of mathematical operations on that number to get an answer. There are 50 different difficulty settings. The lowest difficulty setting gives you ample time to calculate each answer. As the difficulty increases the time that you get to calculate the answer will decrease and also larger numbers will be used for each operation. The different difficulty settings make this app suitable to people who may not have great mathematical abilities and also people that can calculate very quickly.There are two game modes included. One is single challenge mode where you have to calculate a single answer. The other is double challenge mode. In double challenge mode you will have to find and remember the answer to two operations at the same time...