Subtraction of Time

subtraction of time

Mathematics Year 5

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Learning standard

4.3.2 Solve subtraction of time involving fractions

and decimals :

(i) hours to minutes (iv) decades to years

(ii) days to hours (v) centuries to decades

(iii) years to months (vi) centuries to years

with and without conversion of unit.

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Hour to minutes

1 hour = 60 minutes

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1 Based on the table below, calculate the difference in
time taken to complete the project by Raden and Siti.

1 5 hours 3 hours = 1 1 hour
6 4 12

Name Time Taken to Complete =1 5 X 2 hours 3X 3 hour
Raden ¾ hour 6 X 2 4X 3
1, ⅚ hours
Siti =1 10 hours 9 hour
Divani 12 minutes earlier than Siti 12 12

= 1 1 hours
12

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2 Calculate the difference in cooking time, in hours,
between steamed and boiled keropok lekor as labelled in
the pictures.

1.5 hours 0.5 hour = 1 hour

1 . 5 hours
0 . 5 hours
1 0 hours

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Days to hours

1 day = 24 hours

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1 9 day 18 hours 7 day = 8 days 21 hours
8

7 day = 7 X 3 hours day hours
8 8
24 8 42

1 9 18 1
0 21
= 21 hours 24
8 21 + 18

42

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2 6.5 days 7 day = 5 days 22 hours
12

6.5 days = 6 days 0.5 days day hours
= 6 days 1 2 hours
5 36
7 day = 7 X 2 hours 24
12 12 6 12 + 12
24 0 14
36
5 22
1

= 1 4 hours

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Years to months

1 year = 12 months

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1 Subtract 16.875 years and 5.625 years.
16 . 875 years 5.625 years = 11.25 years
1 6 . 8 7 5 years
5 . 6 2 5 years
1 1 2 5 0 years

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2 How many more months is 30.25 years from

29 months?

30.25 years 29 months = 334 months

30.25 years = 30 years 0.25 year

1 = 360 months 3 month 513
= 363 months
0. 2 5 363 months

12 0 2 9 months

1 3 3 4 months

050
0250

0 3 00

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Decades to years

1 decade = 10 years

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1 6 3 decades = 2 decades 7 years
9 decades 10

6 3 decades = 6 decades 3 decades decade year
10 10
8 10
= 6 decades 3 X 1 years
10 9 00
10 6 03

1 2 07

= 6 decades 3 years

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2 9.4 decades 2 1 decades = 6 decades 9 years
2

9.4 decades= 9 decades 0.4 decades decade year

= 9 decades 4 years 8 14

2 1 decades = 2 decades 1 5 years 9 04
2 2 2 05
X 10
6 09
1

= 2 decades 5 years

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Centuries to decades

1 century = 10 decades

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1 1 centuries 1 centuries = 2 centuries
2 10 5

= 1X5 centuries 1 centuries
2X 5 10

= 5 centuries 1 centuries
10 10

= 4 centuries
10

= 2 centuries
5

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2 6 1 centuries 5.7 centuries = 4 decades
10

decade 6 1 centuries =6 centuries 1 X 1 decades
10 10
5 11 10

61 1
57
= 60 decades 1 decades
04
= 61 decades
5.7 centuries = 57 decades

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Century to years

1 century = 100 years

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1 1 1 centuries = 1 century 10 years
4
2 centuries 35 years

1 1 centuries = 1 century 25
4
1 X 100 years
4
1
= 1 century century years
25 years 35
2 25
= 1 century 25 years
1

1 10

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2 1 1 centuries = 25 years
4
1.3 centuries

1.3 centuries = ( 1.3 X 100 ) years years
130
= 130 years 125
005
1 1 centuries = 100 years 25 years
4

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Try These 1. B,D,F
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Thank you!

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