PBJ's Math Fun - Maths packages for the Newton. The Counter - a very simple counting drill for the Newton. Maths 1 - Add or subtract the number of apples on the right, to or from the number of apples on the left. Maths 101 - Multiply, divide, add or subtract two numbers. Maths 9999 - Advanced version of Maths 101. Shopping Fun - An app/exercise for simple arithmatic - add up the cost per item, number of items, and the total amount.