Exercises: 12-Hour and 24-Hour Clocks
Work through each section in order. Use the count-up method for every duration problem.
Recall / Warm-Up
How many minutes are in one hour?
How many hours are in one day?
On a 12-hour clock face, does 3:00 always mean the same time of day?
Yes — a clock face always means the same time
No — 3:00 could be morning (3 a.m.) or afternoon/evening (3 p.m.); the clock face looks identical for both
Fluency Practice
Which 24-hour time matches 9:00 p.m.?
0900
2100
Convert 7:00 a.m. to 24-hour notation.
1900, adding 12 to every conversion regardless of a.m. or p.m.
0700, keeping the hour unchanged for a.m. times and writing it with two digits
Convert 1745 to 12-hour notation. Give your answer as H:MM a.m./p.m., e.g. 5:45 p.m.
Find the duration from 0915 to 1140 using the count-up method. Give your answer as
H h MM min, e.g. 2 h 25 min.
Convert 0920 to 12-hour notation. Give your answer as H:MM a.m./p.m., e.g. 9:20 a.m.
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