Page 15 - Syok Praktis PBD (2023) Mathematics TH4

Mathematics Year 4 Practice 4 Time

4. Correlations between millennium, century, 7. Subtraction of up to two values of time from
decade and year. one value of time. 8 years 6 months
Example: = 7 years 18 months
• 1 decade = 10 years
• 1 century = 100 years (a) 8 years 6 months – 10 months
• 1 millennium = 10 centuries = 7 years 18 months – 10 months
= 7 years 8 months
5. Conversions of units of time. (b) 7 centuries 8 decades 9 years –
× 10 × 100 5 decades 8 years – 3 centuries
1 millennium = 10 centuries 1 century = 100 years = 7 centuries 3 decades 1 year – 3 centuries
= 4 centuries 3 decades 1 year
÷ 10 ÷ 100
× 10 × 12 8. Multiplication of values of time.
1 decade = 10 years 1 year = 12 months Example:
(a) 11 × 2 days 4 hours
÷ 10 ÷ 12 44 hours
× 24 × 7 = 22 days 44 hours = 1 day 20 hours
1 day = 24 hours 1 week = 7 days = 23 days 20 hours

÷ 24 ÷ 7 (b) 5 weeks 1 day × 5
= 25 weeks 5 days
6. Addition of up to three values of time. 9. Division of values of time.
Example: Example:
(a) 3 days 5 hours + 4 days 6 hours (a) 12 years 8 months ÷ 4
= 7 days 11 hours = 3 years 2 months
(b) 4 weeks 4 days + 2 weeks + 5 days (b) 29 decades 4 years ÷ 2
= 7 weeks 2 days
= 28 decades 14 years ÷ 2
9 days = 1 week 2 days
= 14 decades 7 years

Objective Questions
Instruction: Answer all the questions. Select only one correct answer.

12-hour system and 24-hour 3. Convert 7:40 a.m. into the 24-hour system.
4.1 system A 0920 hours
B 0740 hours
1. Write 1410 hours in the 12-hour system. C 1720 hours
A 4:10 p.m. C 2:10 p.m. D 1940 hours
B 3:10 p.m. D 1:10 p.m.
4. Convert 3:25 p.m. into the 24-hour system.
2. Write 0625 hours in the 12-hour system.
A 6:25 a.m. A 1335 hours
B 7:25 a.m. B 1425 hours
C 1525 hours
C 10:25 a.m. D 1635 hours
D 11:25 a.m.

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