Final answer:
To add military times, add the hours and minutes separately. Carry over excess minutes to hours if necessary. Therefore, 0645 + 1135 = 1820.
Step-by-step explanation:
To add military times, we need to add the hours and minutes separately. 
- First, add the hours together: 06 + 11 = 17.
- Then, add the minutes together: 45 + 35 = 80.
- Since 80 minutes is more than 60 minutes, we need to carry over the excess to the hours. We divide 80 by 60, which gives us 1.2. This means we need to add 1 hour to our previous sum of 17 hours.
- Finally, we combine the hours and minutes: 17 hours + 1 hour = 18 hours, 80 minutes = 1 hour 20 minutes.
Therefore, 0645 + 1135 = 1820.