What is the sum of 12 and 23?

Step-by-step solution

1. Add the units digit: $2+3=5$ (no carry).
2. Add the tens digit: $1+2=3$ (no carry).
3. Combine the results: $3$ tens $5$ units $=35$.

Concept tested: Addition without carry

Published 7 October 2026 · How this solution was prepared and checked