3.CE.1.c
Apply strategies (e.g., place value, properties of addition, other number relationships) and algorithms, including the standard algorithm, to determine the sum or difference of two whole numbers where addends and minuends do not exceed 1,000.
Khan Academy ResourcesAdd within 1000Subtract within 1000Select strategies for subtracting within 1000Break apart 3-digit subtraction problemsAdd and subtract within 1000 word problemsFind the missing number (add and subtract within 1000)Subtraction by breaking apartAdding 3-digit numbersSubtracting 3-digit numbers (regrouping) Worked example: Subtracting 3-digit numbers (regrouping twice)Worked example: Subtracting 3-digit numbers (regrouping from 0)Methods for subtracting 3-digit numbersUsing place value to add 3-digit numbers: part 1Three digit addition word problemsWorked example: Subtracting 3-digit numbers (regrouping) Three digit subtraction word problemsMissing number for 3-digit subtraction within 1000Missing number for 3-digit addition within 1000Using place value to add 3-digit numbers: part 2

1-on-1 AI tutoring aligned to 3.CE.1.c. Instant help for students, real-time insights for teachers.
Used in classrooms by 100,000+ students at Baltimore County, Plano ISD, Deer Valley USD, KIPP, and districts nationwide.
Free for teachers, forever →