The Calculadder 1 workbook includes 12 copies each of Levels 1 to 16 of the Calculadder drills plus Guide, QuicKeys and Achievement Record. The drills cover all the basic addition and subtraction facts that kids should memorize. These drills have 2 or 3-minute time goals. Level 1 helps kids gain speed in writing the numerals, then Level 2 starts to drill on very simple addtion facts. Subsequent levels introduce more facts while reviewing previous ones. Levels 15 and 16 provide an overall review Calculadder 1.