Portions of Time
Conversion between time units:
1 minute = 60 seconds
1 hour = 60 minutes
1 day = 24 hours
1 week = 7 days
1 month = 30 days = 4 weeks (approximately)
1 year = 12 months = 365 days = 52 weeks (approximately)
1 decade = 10 years
1 century = 100 years
1 millennium = 1000 years
Let's consider an example.
We know,
1 minute = 60 seconds
Convert the minutes into seconds by multiplying number of minutes by 60.
20 × 60 = 1200
So, 20 minutes = 1200 seconds
1 
2 
1200 ÷ 2 = 600
So, 

of 1200 seconds = 600 seconds. 

of 20 minutes is 600 seconds. 
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Help
The correct answer is
Remember :
The smallest number is the one that comes first while counting.
Solution :
To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.
21,27,23
21 is the smallest number.