Description Level F Learning Objectives Building on the mental math skills developed in Level E, this level focuses on mastering written calculation through vertical addition and subtraction practice. Volume (Book, Month) / Week - Learning Content Book F1, Weeks 1–4 Addition up to sums of 99 (vertical form) (Two-digit number + one-digit number, no carrying) (Two-digit number + two-digit number, no carrying) (Two-digit number + one-digit number, with carrying) (Two-digit number + two-digit number, with carrying) Achievement Test Book F2, Weeks 1–4 Two-digit addition (carrying in the tens place) Two-digit addition review Achievement Test Book F3, Weeks 1–4 Three-digit addition (Three-digit number + one-digit number), (Three-digit number + two-digit number) (Three-digit number + three-digit number) Three-digit addition review Four-digit addition (Four-digit number + one-digit number), (Four-digit number + two-digit number), (Four-digit number + three-digit number), (Four-digit number + four-digit number) Four-digit addition review Achievement Test Book F4, Weeks 1–4 One-digit subtraction (vertical form) Two-digit subtraction (Two-digit number - one-digit number, no borrowing) (Two-digit number - two-digit number, no borrowing) (Two-digit number - one-digit number, with borrowing) (Two-digit number - two-digit number, with borrowing) Two-digit subtraction review Achievement Test Book F5, Weeks 1–4 Three-digit subtraction (Three-digit number - one-digit number), (Three-digit number - two-digit number) (Three-digit number - three-digit number) Four-digit subtraction (Four-digit number - one-digit number), (Four-digit number - two-digit number) (Four-digit number - three-digit number), (Four-digit number - four-digit number) Three- and four-digit subtraction review Final Test