Three Digit Addition Vertical
Arithmetic Drill · answer format: Number
three digit addition worksheets
Three-Digit Addition Worksheets and Step-by-Step Help
Regrouping in addition means trading ten ones for one ten so each place value column stays organized.
Skill routine
Regroup ten ones as one ten
- Line up the digits by place value.
- Add the ones column first.
- If there are ten or more ones, regroup ten ones as one ten.
- Add the tens and hundreds columns, including any regrouped amount.
- Estimate or use place value to check that the answer is reasonable.
Practice types
What this page can generate next.
Common mistakes
Common addition mistakes
Most addition errors come from counting mistakes, place value confusion, or losing track during regrouping.
Counting the starting number as one
Misaligning tens and ones
Forgetting the regrouped ten
Coverage