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24-Hour Clock Relationship between Units of Time

2400 hours • 1 minute = 60 seconds
or
0000 hours • 1 hour = 60 minutes
2300 hours 0100 hours
2200 hours 11 12 1 0200 hours • 1 day = 24 hours
2100 hours 10 midnight 2 0300 hours
9 3 • 1 week = 7 days
2000 hours 0400 hours
8 4 • 1 month = 30 days
1900 hours 7 5 0500 hours • 1 year = 365 days
1800 hours 6 p.m. a.m. 6 0600 hours • For a leap year = 366 days

1700 hours 5 7 0700 hours • 1 year = 12 months
4 8
1600 hours 0800 hours
3 9
1500 hours 2 1 noon 10 0900 hours
1400 hours 12 11 1000 hours
1300 hours 1100 hours
1200 hours

Operations of Units of Time

Addition Subtraction Multiplication Division

3 hours
hours minutes
5 16 25
h min s – 15
1 hour + 25 minutes
1
5 hours 25 minutes h min 1 15 20 = 85 minutes
2
+ 6 hours 45 minutes – 7 60 × 4 17
6
25
12 hours 10 minutes 1 35 9 01 20 5 85 minutes
= 12 hours 10 minutes = 1 hour 35 minutes = 9 hours 1 minute – 5
20 seconds 35 minutes
– 35
0 minutes
= 3 hours 17 minutes

Conversion of Units of Time

Using a Double Number line
×7 ×24 ×60 ×60
Weeks Days Hours Minutes Seconds
× 4
÷7 ÷24 ÷60 ÷60 1 min 2 min 4 min 10 min 16 min 22 min 30 min

× 60
Multiply (×)
60 s 120 s 240 s 600 s 960 s 1320 s 1800 s
Bigger Smaller × 4
unit unit
Divide (÷)

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