Using the 10‑10‑10 smart chart, what is $23+38$?

Step-by-step solution

1. $23$ and $38$ are written as $20+3$ and $30+8$. Use the 10‑10‑10 chart to add the tens: $20+30=50$. Add the units using the units column of the chart: $3+8=11$. Carry over $1$ from the units to the tens. Add the carried $1$ to $50$ to get $51$. Finally add the remaining $10$ from the units column of the chart to obtain $61$.
2. final calculation: $51+10=61$

Concept tested: 10‑10‑10 chart addition

Published 16 October 2026 · How this solution was prepared and checked