The Calculadder 5 workbook includes 12 copies each of Levels 65 to 80 of the Calculadder drills, Guide, QuicKeys and Achievement Record. The drills have 5-minute time goals. After a long division review drill Calculadder 5 thoroughly covers all aspects of fractions and mixed numbers including addition, subtraction, multiplication and division as well as reciprocals, common denominators, improper fractions and more.