1. **State the problem:** We need to add the decimals for questions 26 to 30 and round the answer for question 26 to the nearest whole number. 2. **Recall the addition rule for decimals:** Align the decimal points and add digit by digit. 3. **Question 26:** Add $0.045 + 0.012$ and round to the nearest whole number. $$0.045 + 0.012 = 0.057$$ Rounding $0.057$ to the nearest whole number gives $0$. 4. **Question 27:** Add $12.3 + 17$. $$12.3 + 17 = 29.3$$ 5. **Question 28:** Add $0.0054 + 0.021$. Align decimals: $$0.0054 + 0.0210 = 0.0264$$ 6. **Question 29:** Add $0.012 + 0.021$. $$0.012 + 0.021 = 0.033$$ 7. **Question 30:** Add $0.52 + 0.21$. $$0.52 + 0.21 = 0.73$$ **Final answers:** 26. $0$ 27. $29.3$ 28. $0.0264$ 29. $0.033$ 30. $0.73$