3-Digit Addition Worksheet for Kids
Ages 6-8 · Grade 1–Grade 2Ages 6-8 · Year 2–Year 3Ages 6-8 · Class 1–Class 2Ages 6-8
Adding two three-digit numbers requires children to work through the ones, tens, and hundreds columns in order and understand how a sum in one column can carry over into the next, a significant step up from single-digit addition. For ages six to eight, mastering this column-based process builds the procedural fluency needed for all future multi-digit arithmetic.