Page 159 - Mathematics_Std_4

10. hours minutes 11. hours minutes 12. hours minutes

3 15 3 05 4 12
+ 2 45 + 8 55 + 3 50
FOR ONLINE READING ONLY

13. hours minutes 14. hours minutes 15. hours minutes
2 10 8 20 6 30
+ 3 54 + 1 45 + 2 40

Subtraction of measurements of time

Subtraction of measurements of time considers the relationship
between the given units. For example, if it involves hours and
minutes; subtract the minutes first, then hours.

Example 1

hours minutes
6 25
− 5 15

Steps Solution

1. Subtract minutes: −25 =15 10. Write hours minutes
10 in the minutes column. 6 25
− 5 15
2. Subtract hours: − =6 5 1. Write 1 in

the hours column. 1 10

Therefore, the answer is 1 hour 10 minutes.

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06/11/2024 17:17:56
MATHEMATICS STD 4 PB 2024.indd 152
MATHEMATICS STD 4 PB 2024.indd 152 06/11/2024 17:17:56