Printable Three-Digit Addition Worksheets
Printable three-digit addition worksheets for 2nd and 3rd grade, with an answer key on every sheet. The sets below cover 3 different skills, so you can start where your child actually is. Available as speed drills and word problems.
Targeted Practice by Skill
About Three-Digit Addition
What this skill is
Three-digit addition expands vertical column addition to hundreds, tens, and ones, handling single and double regrouping (ones to tens, tens to hundreds).
When children learn it
Three-digit addition is taught in 2nd and 3rd grade, aligned to Common Core standard 2.NBT.B.7.
Teaching Tips
- Use graph paper grid boxes to keep hundreds, tens, and ones aligned.
- Check carrying marks above both tens and hundreds columns.
Common Mistakes
- Forgetting to carry over into the hundreds column when tens sum exceeds 9.
- Misaligning columns when adding a 2-digit number to a 3-digit number.
More Addition Concepts
Addition SentencesAddition Within 10Addition with Number LinesNumber BondsAddition Facts to 20Doubles and Near DoublesAdding Whole Tens and HundredsFact FamiliesMaking the Next TenTwo-Digit AdditionAddition Word ProblemsAdding Three or More NumbersMissing AddendMental Addition4-Digit AdditionAdding Large Numbers