Description Level C Learning Goals Building on the number-writing skills learned in Level B, this level focuses on practicing addition with 1 through 4 to help children master the basic concept of addition. Volume (Book/Month) - Issue (Week) - Learning Content Book C1, Weeks 1~4: Understanding Adding 1 (the next number) - The next number and adding 1 - Adding 1: (1~9)+1, (1~14)+1, (1~19)+1, (1~25)+1, (1~30)+1, (1~60)+1, (1~70)+1, (1~80)+1, (1~99)+1, (1~200)+1, (1~999)+1 - Achievement Test Book C2, Weeks 1~4: Understanding Adding 2 - Adding 2: (1~8)+2, (1~17)+2, (1~22)+2, (1~28)+2, (1~35)+2, (1~40)+2, (1~45)+2 - Achievement Test Book C3, Weeks 1~4: Understanding Adding 3 - Adding 3: (1~9)+3, (1~16)+3, (1~19)+3, (1~26)+3, (1~29)+3, (1~32)+3, (1~36)+3 - Addition Making a Sum of 10 - Achievement Test Book C4, Weeks 1~4: Adding 4: (1~10)+4, (1~15)+4, (1~19)+4, (1~26)+4 - Addition Making a Sum of 10 - Achievement Test Book C5, Weeks 1~4: Comprehensive Practice up to Adding 4: up to (1~6)+4, up to (1~9)+4, up to (1~16)+4, up to (1~19)+4 - Final Test