Abstract: A method, apparatus and computer program determine first and second user input for scrolling a first band and a second band on a display. The first band and the second band comprise lines of numbers in numerical order. The first band and second band have respective positions corresponding to currently selected numbers on the bands. First and second operands are determined from the first user input and the second user input, the first operand being the currently selected number on the first band and the second operand being the currently selected number on the second band. On the display are displayed results of at least two mathematical operations involving the first operand and the second operand, in direct response to the determining of at least one of the first operand and the second operand.