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Conversion of Lower Units into Higher Units

To convert lower units of time into higher units, we divide.
Example 4: Convert 3308 seconds into minutes and seconds. 55

Solution: Since 60 seconds = 1 minute, 60 3308
300
3308 seconds = (3308 ÷ 60) minutes. 308

Quotient = 55, Remainder = 8 300
Thus, 3308 seconds = 55 minutes 8 seconds. 8
Example 5: Convert 532 minutes into hours and minutes.
8
Solution: Since 60 minutes = 1 hour, 60 532
532 minutes = (532 ÷ 60) hours. 480

Quotient = 8, Remainder = 52 52
Thus, 532 minutes = 8 hours 52 minutes.
Example 6: Convert 789 hours into days and hours. 32

Solution: Since 24 hours = 1 day, 24 789
72
789 hours = (789 ÷ 24) days. 69

Quotient = 32, Remainder = 21 48
Thus, 789 hours = 32 days 21 hours. 21
Conversion Using Double number Line

Example 7: Use the double number line to convert the following:
× 4

1 min __ min 4 min 10 min 16 min ____ min ____ min
× 60

60 s 120 s ___ s ____ s ____ s 1320 s 1800 s

× __
× 4
1 min 2 min 4 min 10 min 16 min 22 min 30 min

Solution: × 60

60 s 120 s 240 s 600 s 960 s 1320 s 1800 s
× 4

Practice Time 9B

1. Convert the following:

( a) 9 minutes into seconds (b) 12 minutes 54 seconds into seconds
( c) 3 hours 25 minutes 16 seconds into seconds
( d) 14 hours into minutes (e) 9 hours 54 minutes into minutes
( f) 9 days into hours (g) 8 days 19 hours into hours

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