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