Description Level E Learning Goals Building on the basic mental arithmetic skills developed in Level D, children learn basic subtraction up to 10, and through continued practice of addition and subtraction, work toward completing their mental math abilities. Book (Volume/Month) - Week - Learning Content E1: Weeks 1-4 Understanding subtraction (smaller numbers) Subtracting 1: (1~12)-1 Subtracting 2: (1~13)-2 Subtracting 3: (1~15)-3 Practice up to (1~15)-3 Achievement Test E2: Weeks 1-4 Subtracting 4~10 (1~15)-4, (1~15)-5, (1~15)-6, (1~15)-7, (1~15)-8, (1~15)-9, (1~15)-10 Practice up to (1~15)-10 Achievement Test E3: Weeks 1-4 Subtracting from numbers 11~12 Subtracting from numbers 13~14 Subtracting from numbers 15~16 Subtracting from numbers up to 16 Comprehensive Achievement Test E4: Weeks 1-4 Subtracting from numbers 17~19 Subtracting from numbers 20~22 Subtracting from numbers 23~25 Subtracting from numbers up to 25 Comprehensive Achievement Test E5: Weeks 1-4 Complete review of addition and subtraction (Levels C~E) Final Test