Mathematics · Grades 2–3
Two-digit addition
Regroup ten ones as one ten when needed.
The key idea
Regroup ten ones as one ten when needed.
ones + ones; tens + tens
Worked examples
66 + 35 = ?
66 + 35 = 101
101
47 + 75 = ?
47 + 75 = 122
122
Try it yourself
31 + 69 = ?
88 + 50 = ?
Check your understanding
Answers and marking notes
- 100
31 + 69 = 100
- 138
88 + 50 = 138
Further reading and review references
These are reference links, not copied exercises, institutional endorsement or proof of independent review.
Learning preview · teacher review required. Grade bands are approximate, not official curriculum alignment.