1. Calculate $6.8 \times 3 = 20.4$. 2. Calculate $15 \times 0.7 = 10.5$. 3. Calculate $0.41 \times 5 = 2.05$. 4. Calculate $20.8 \times 9 = 187.2$. 5. Calculate $7.19 \times 2.2 = 15.818$. 6. Calculate $115.3 \times 0.5 = 57.65$. 7. Calculate Amber's weekly walking distance: $1.87 \times 5 = 9.35$ miles. 8. Calculate Hayden's total price: $1.79 \times 3.45 = 6.1755$, rounded to $6.18$. 9. Check Sidney's calculation: $62.8 \times 3.7 = 232.36$, Sidney's answer $2323.60$ is incorrect. 10. Check Jorge's calculation: $50.9 \times 4.8 = 244.32$, Jorge's answer is correct.