Work through the levels in order. Type your answer and press Check — open the worked solution if you get stuck. Answers like -6, 3/4 or 0.25 are typed exactly as shown. A ⭐ Bonus Challenge at the end is extra credit — skip it if the rest was hard work.
Level 1 · Warm-up
1 Convert 9:15 pm to 24-hour time (as a 24-hour time).
Show worked solution
9 + 12 = 21 → 2115.
2 Convert 0640 to 12-hour time (as a digital time).
Show worked solution
Morning hour → 6:40 am.
3 How many minutes from 1050 to 1130?
Show worked solution
10 + 30 = 40 min.
Level 2 · Core
4 Elapsed time from 0745 to 1215?
Show worked solution
15 min → 0800, 4 h → 1200, 15 min → 4 h 30 min.
5 Sydney (UTC+10) is 6:00 pm. Time in Adelaide (UTC+9½)? (as a digital time)
Show worked solution
Half an hour behind → 5:30 pm.
6 A movie starts 1935 and runs 2 h 40 min. Finish time? (as a 24-hour time)
Show worked solution
1935 + 2 h = 2135, + 40 = 2215.
Level 3 · Challenge
7 Depart Sydney (UTC+10) 0730, fly 4 h to Perth (UTC+8). Local arrival? (as a 24-hour time)
Show worked solution
Sydney clock 1130 → Perth 0930.
8 Left Auckland (+12) at 0900, landed Sydney (+10) at 1030 local. Flight time?
Show worked solution
0900 Auckland = 0700 Sydney; 0700 → 1030 = 3 h 30 min.
9 A bus leaves every 25 min starting 0710. You arrive at the stop at 0905. How long until the next bus? (minutes)
Show worked solution
Departures: 0710, 0735, 0800, 0825, 0850, 0910 → wait 5 min.