To add 3 dollars and 35 cents to 5 dollars and 78 cents, write each amount as a decimal. Since 3.35 + 5.78=9.13, the total is 9 dollars and 13 cents. Can you add 2 hours 45 minutes to 3 hours 57 minutes by using decimal numbers (2.45 + 3.57)? Explain your reasoning.