Do you need a calculator to work out your shopping bill? Would you like to get some practice in doing arithmetic in your head? This app, "Arithmetic Brain", is a trainer to help you do arithmetic in your head, which randomly generates sets of 10 questions for each level. There are controls to select specific question sets, move to the next question, and view the current questions and answers and best scores for every level played in the current session.

The levels included are:
• 1 : + => 10 questions about the addition of 2 numbers between 2 and 11.
• 2 : - => 10 questions about the subtraction of 2 numbers between 2 and 18.
• 3 : x => 10 questions about the multiplication of 2 numbers between 2 and 10.
• 4 : x ! => 10 questions about the multiplication of 2 numbers between 6 and 12.
• 5 : (+)- => 10 questions about the addition and subtraction of 3 numbers between 2 and 18.
• 6 : (x)+ => 10 questions about the multiplication and addition of 3 numbers between 2 and 10.
• 7 : (-)x => 10 questions about the subtraction and multiplication of 3 numbers between 2 and 12.
• 8 : (+)x => 10 questions about the addition and multiplication of 3 numbers between 2 and 10.