Exercises: 12-Hour and 24-Hour Clocks

Work through each section in order. Use the count-up method for every duration problem.

Grade 7·20 problems·~27 min·Uganda NCDC Primary 7 Mathematics·lesson·time-01

Work through problems with immediate feedback

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

$Analogue clock face showing 9 o'clock with a.m. and p.m. both shown as question marks$

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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