Maharashtra Board Class 5 Maths Chapter 10 Measuring Time Set 44 Solutions

Question 1. The time below is given by the 12 hour clock. Write the same by the 24 hour clock.
(1) 30 minutes past 10 in the morning
(2) 10 minutes past 8 in the morning
(3) 20 minutes past 1 in the afternoon
(4) 40 minutes past 5 in the evening
Answer:
(1) [10:30]
(2) [8:10]
(3) [13:20]
(4) [17:40]
In simple words: This question asks to convert times from a 12-hour format, which uses 'am' and 'pm', into a 24-hour military time format, where hours are counted from 00:00 to 23:59.

🎯 Exam Tip: Remember to add 12 to the hour for any time from 1 PM to 11 PM when converting to 24-hour format, and 12 midnight (12 AM) becomes 00:00.

Question 2. Match the following.
12 hour clock - 24 hour clock
(1) 9:10 am - 23:10
(2) 2:10 pm - 7:25
(3) 5:25 pm - 14:10
(4) 11:10 pm - 9:10
(5) 7:25 am - 17:25
Answer:
(1) - d
(2) - c
(3) - e
(4) - a
(5) - b
In simple words: This question requires matching corresponding times between the 12-hour clock format (with AM/PM) and the 24-hour clock format.

🎯 Exam Tip: Pay close attention to AM and PM to correctly identify the 24-hour equivalent. For PM times (except 12 PM), add 12 hours to the 12-hour clock time.

Examples Of Time Measurement

Example (1) If Abdul started working on the computer at 11 in the morning and finished his work at 3:30 in the afternoon, how long did he work?
Method 1:
From 11 in the morning to 12 noon, it is 1 hour. From 12 noon to 3:30 in the afternoon, it is 3 hours and 30 minutes. Therefore, the total time is 4 hours and 30 minutes.
Method 2:
According to the 24 hour clock, 11'o'clock in the morning is 11:00 and 3:30 in the afternoon is 15:30.

Abdul worked for a total of 4 hours and thirty minutes, or four and a half hours.
In simple words: This example demonstrates two methods to calculate the duration of work: one by breaking down the time duration into smaller, easily calculable segments, and the other by converting to a 24-hour format and subtracting.

🎯 Exam Tip: When calculating time durations, converting to a 24-hour clock can simplify subtraction, especially when crossing midnight or noon. Alternatively, break the problem into segments that go up to the nearest hour or half-day.

Example (2) Add : 4 hours 30 min + 2 hours 45 min

75 min = 1 hour 15 min
In simple words: This example shows how to add two durations of time, involving carrying over minutes that exceed 60 into hours.

🎯 Exam Tip: When adding time, always add minutes first. If the total minutes are 60 or more, convert 60 minutes to 1 hour and add it to the hours column, leaving the remaining minutes.

Example (3) Subtract : 5 hr 30 min - 2 hr 45 min

45 minutes cannot be subtracted from 30 minutes. Therefore, we borrow 1 hour and convert it into 60 minutes for the subtraction.
In simple words: This example illustrates subtracting time durations where borrowing from the hours is necessary because the minutes to be subtracted are greater than the available minutes.

🎯 Exam Tip: When subtracting time and the minutes in the minuend are less than the minutes in the subtrahend, borrow 1 hour (60 minutes) from the hours column and add it to the minutes column before performing subtraction.

Example (4) Amruta travelled by bus for 3 hours 40 minutes and by motorcycle for 1 hour 45 minutes. How long did she spend travelling?

Travel time by bus
Travel time by motorcycle
Total travel time
(60 + 25) minutes are 85 minutes, that is, 1 hour and 25 minutes. Let us add this 1 hour to 4 hours. Therefore, Amruta travelled for a total of 5 hours and 25 minutes.
In simple words: This example demonstrates how to find the total travel time by adding durations, including converting excess minutes (over 60) into hours.

🎯 Exam Tip: When calculating total time for multiple activities, add the hours and minutes separately. If the total minutes exceed 60, convert the extra minutes into hours and add them to the total hours.

Measuring Time Problem Set 44 Additional Important Questions And Answers

The time is given by the 12-hour clock. Write the same by the 24-hour clock.
(1) 15 minutes past 9 in the evening
(2) 12 midnight
Answer:
[21:15]
[00:00]
In simple words: This question requires converting specific times from the 12-hour clock format to the 24-hour clock format.

🎯 Exam Tip: For 12-hour PM times, add 12 to the hour to get the 24-hour equivalent. For 12 midnight, it is 00:00 in 24-hour format.

The time below is given by the 24-hour clock. Write the same by the 12-hour clock.
(1) 20:20 =
(2) 9:30 =
(3) 23:00 =
(4) 4:00 =
(5) 12:00 =
(6) 00:00 =
Answer:
[8:20 pm]
[9:30 am]
[11 pm]
[4 am]
[12 noon] or [12:00]
[12 midnight]
In simple words: This question involves converting various times from the 24-hour clock format back to the 12-hour clock format, correctly indicating AM or PM.

🎯 Exam Tip: For 24-hour times greater than 12:00, subtract 12 to get the PM equivalent. Times before 12:00 are AM, with 00:00 being 12 AM (midnight) and 12:00 being 12 PM (noon).