Samacheer Kalvi Class 4 Maths Solutions Term 2 Chapter 5 Time InText Questions

Do Yourself (Text Book Page No. 33)

Question 1. 8 o' Clock in the morning
Answer: When it is 8 o'clock in the morning, we write it as 8:00 a.m. The 'a.m.' part tells us it is before noon. This is a common way to show morning times.
In simple words: 8 o'clock in the morning is simply written as 8:00 a.m.

🎯 Exam Tip: Remember 'a.m.' is for morning (before noon) and 'p.m.' is for afternoon/evening (after noon).

Question 2. 4 o' Clock in the evening
Answer: When it is 4 o'clock in the evening, we write it as 4:00 p.m. The 'p.m.' part tells us it is after noon. This helps us know if the time is in the morning or evening.
In simple words: 4 o'clock in the evening is written as 4:00 p.m.

🎯 Exam Tip: Always pay attention to whether the time is in the morning or evening to use 'a.m.' or 'p.m.' correctly.

Question 3. 10 o' Clock in the night
Answer: When it is 10 o'clock at night, we write it as 10:00 p.m. The 'p.m.' means it is past noon and into the evening or night hours. This way of writing helps avoid confusion about the time of day.
In simple words: 10 o'clock at night is shown as 10:00 p.m.

🎯 Exam Tip: Times from noon until midnight are generally denoted with 'p.m.'.

Question 4. 5 hours after noon
Answer: Noon is 12:00 p.m. If we count 5 hours after noon, we get to 5:00 p.m. This is how we find times that are a certain number of hours after or before noon.
In simple words: 5 hours after 12:00 noon is 5:00 p.m.

🎯 Exam Tip: 'Noon' refers to 12:00 p.m. and 'midnight' refers to 12:00 a.m.

Question 5. 3 hours before noon
Answer: Noon is 12:00 p.m. If we count back 3 hours from noon, we reach 9:00 a.m. This shows a time in the morning, before the day's peak.
In simple words: 3 hours before 12:00 noon is 9:00 a.m.

🎯 Exam Tip: When counting backwards from noon, the time will switch from 'p.m.' to 'a.m.' at 12:00 (midnight) or before noon.

Think It (Text Book Page No. 33)

Question. Convert 01:00 (24-hour format) to 12-hour format.
Answer: In the 24-hour clock, 01:00 means one hour past midnight. When we convert this to the 12-hour format, it becomes 1:00 a.m. This is the first hour after the day officially starts.
In simple words: 01:00 in 24-hour time is 1:00 a.m. in 12-hour time.

🎯 Exam Tip: For 24-hour times from 00:00 to 11:59, the 12-hour equivalent will be 'a.m.'.

Question. Convert 12:00 (24-hour format) to 12-hour format.
Answer: In the 24-hour clock, 12:00 represents exactly noon. In the 12-hour format, this time is shown as 12:00 p.m. This is the dividing point between morning and afternoon.
In simple words: 12:00 in 24-hour time is 12:00 p.m. in 12-hour time.

🎯 Exam Tip: The transition from 'a.m.' to 'p.m.' happens exactly at 12:00 noon. 12:00 a.m. is midnight.

Question. Convert 13:00 (24-hour format) to 12-hour format.
Answer: In the 24-hour clock, 13:00 means one hour past noon. To convert this to 12-hour format, we subtract 12 from 13, which gives us 1, and since it's after noon, it becomes 1:00 p.m. This helps us understand times in the afternoon.
In simple words: 13:00 in 24-hour time is 1:00 p.m. in 12-hour time.

🎯 Exam Tip: For 24-hour times from 13:00 onwards, subtract 12 from the hour to get the 'p.m.' equivalent.

Activity (Text Book Page No. 35)

Question 1. Convert the following clock time into 24 hour time. Two examples are done for you.
(i) 12hr → 24hr
(ii) 4:25 a.m → 04:25
(iii) 9:20 a.m →
(iv) 6:30 p.m →
Answer:
(i) 12hr → 24hr (This is a general statement, not a specific conversion, indicating the process)
(ii) 4:25 a.m → 04:25 (This is an example, not a question to be solved)
(iii) 9:20 a.m → 09:20
(iv) 6:30 p.m → 18:30
In simple words: For 'a.m.' times, the 24-hour format is often the same, just add a leading zero if needed. For 'p.m.' times, you add 12 to the hour to get the 24-hour format.

🎯 Exam Tip: Always check if the time is 'a.m.' or 'p.m.'. For 'a.m.' times before 10, add a leading zero (e.g., 9:20 a.m. becomes 09:20). For 'p.m.' times, add 12 to the hour (e.g., 6 p.m. becomes 18).

Question 2. Convert the following clock time into 12 hour time. Two examples are done for you.
(i) 24 hr → 12hr
(ii) 11:00 → 11:00 a.m
(iii) 8:00 →
(iv) 12:28 →
(v) 16:20 →
Answer:
(i) 24 hr → 12hr (This is a general statement, not a specific conversion)
(ii) 11:00 → 11:00 a.m (This is an example, not a question to be solved)
(iii) 8:00 → 8:00 a.m
(iv) 12:28 → 12:28 p.m
(v) 16:20 → 4:20 p.m
In simple words: For 24-hour times under 12:00, it's 'a.m.'. For 12:00 itself, it's 12:00 p.m. For times above 12:00, subtract 12 to get the 'p.m.' hour.

🎯 Exam Tip: For 24-hour times from 00:00 to 11:59, the 12-hour equivalent is 'a.m.' (00:00 is 12:00 a.m.). For 12:00, it is 12:00 p.m. For 13:00 to 23:59, subtract 12 from the hour and use 'p.m.'.