1. Problem: Calculate the sum $1.25 + 0.29$. 2. Formula: Addition of decimals is done by aligning the decimal points and adding digit by digit. 3. Work: $$1.25 + 0.29 = 1.54$$ 4. Explanation: Adding $1.25$ and $0.29$ gives $1.54$ because $0.25 + 0.29 = 0.54$ and $1 + 0 = 1$. Final answer: $1.54$