Description Level C Learning Objectives Building on the number-writing skills learned in Level B, this level focuses on mastering the basic concept of addition through practice with adding numbers 1 through 4. Book (Volume/Month) - Issue (Week) - Learning Content C1 Book, Weeks 1-4: Understanding Addition of 1 (the next number) - The next number and adding 1 - Addition of 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 C2 Book, Weeks 1-4: Understanding Addition of 2 - Addition of 2: (1~8)+2, (1~17)+2, (1~22)+2, (1~28)+2, (1~35)+2, (1~40)+2, (1~45)+2 - Achievement Test C3 Book, Weeks 1-4: Understanding Addition of 3 - Addition of 3: (1~9)+3, (1~16)+3, (1~19)+3, (1~26)+3, (1~29)+3, (1~32)+3, (1~36)+3 - Addition problems that sum to 10 - Achievement Test C4 Book, Weeks 1-4: Addition of 4 - (1~10)+4, (1~15)+4, (1~19)+4, (1~26)+4 - Addition problems that sum to 10 - Achievement Test C5 Book, Weeks 1-4: Comprehensive Review of Addition up to 4 - Up to (1~6)+4, up to (1~9)+4, up to (1~16)+4, up to (1~19)+4 - Final Test