Page 3 - LN 8
P. 3
Min Sec
39 75
40 15
- 19 20
20 55
Step 1: 15 sec < 20 sec
So borrow 1 minute from 40 minutes and change it into seconds.
60 seconds + 15 seconds = 75 seconds
Subtract seconds.
75 sec – 20 sec = 55 sec
Step 2: Subtract minutes.
39 min – 19 min = 20 min
Therefore, required answer is 20 minutes 55 seconds.
Example 4: Find the difference between 1 hours 20 minutes and 4 hours 50
minutes.
Answer:
Hour Min
4 50
-
1 20
3 30
Step 1: 50 min > 20 min
Subtract minutes.
50 minutes – 20 minutes = 30 minutes
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