Optimized Big buttons Simple In simple mode only basic functionality will be available from the main screen. Result is rounded up to 5 digits. Engineer In engineer mode special functions will be used on the main screen. Result is is not rounded and is presented in engineer notation. Start wizard Excellent! Tap button one more time to try again Tap button once to use 9 Drag from the center of the button up to use % Drag from the center of the button to the left to use sin Drag from the center of the button down to use ^2 Welcome Choose layout Choose mode Calculator in separate window Drag button basics