CBSE Class 5 Mathematics Time Worksheet

Solve and match the answers to the decoder to find out 'THE LARGEST ISLAND IN THE WORLD'.

Question 1. 3 min 30 sec + 2 min 30 sec
Answer: 3 min 30 sec + 2 min 30 sec = 5 min 60 sec
Since 60 sec = 1 min, adding it to 5 min gives 6 min.
Matching with the decoder, 6 min corresponds to letter G.
In simple words: Add the seconds first, convert 60 seconds into 1 minute, and add it to the total minutes.

Exam Tip: Always remember that 60 seconds make 1 minute and 60 minutes make 1 hour when converting units of time.

Question 2. 2 h 30 min + 1 h 40 min
Answer: 2 h 30 min + 1 h 40 min = 3 h 70 min
Since 70 min = 1 h 10 min, adding 1 h to 3 h gives 4 h 10 min.
Matching with the decoder, 4 h 10 min corresponds to letter E.
In simple words: Add hours to hours and minutes to minutes, then convert every 60 minutes into 1 hour.

Exam Tip: When minutes exceed 60, carry over 60 minutes as 1 hour to the hour column.

Question 3. 15 min - 10 min 10 sec
Answer: Borrow 1 min (60 sec) from 15 min, making it 14 min 60 sec.
14 min 60 sec - 10 min 10 sec = 4 min 50 sec.
Matching with the decoder, 4 min 50 sec corresponds to letter R.
In simple words: To subtract seconds when no seconds are given, borrow 1 minute and write it as 60 seconds.

Exam Tip: Borrowing is essential in time subtraction whenever the bottom seconds or minutes are greater than the top ones.

Question 4. 6 h 20 min - 3 h 30 min
Answer: Borrow 1 h (60 min) from 6 h, making it 5 h 80 min.
5 h 80 min - 3 h 30 min = 2 h 50 min.
Matching with the decoder, 2 h 50 min corresponds to letter D.
In simple words: Since 30 minutes cannot be subtracted from 20 minutes, borrow 1 hour to make it 80 minutes before subtracting.

Answer: Borrow 1 year (12 months) from 3 years, making it 2 years 14 months.
2 years 14 months - 1 year 3 months = 1 year 11 months.
Matching with the decoder, 1 year 11 months corresponds to letter A.
In simple words: Remember that 1 year has 12 months when you need to borrow for month subtraction.

Exam Tip: In problems involving years and months, the conversion factor is 12 months = 1 year.

Question 6. 5 min 15 sec + 7 min 50 sec
Answer: 5 min 15 sec + 7 min 50 sec = 12 min 65 sec
Since 65 sec = 1 min 5 sec, adding 1 min to 12 min gives 13 min 5 sec.
Matching with the decoder, 13 min 5 sec corresponds to letter N.
In simple words: Sum up the seconds and minutes separately, then simplify the seconds by converting every 60 seconds into 1 minute.

Exam Tip: Always ensure the final answer has fewer than 60 seconds.

Question 7. 8 h 35 min - 3 h 40 min
Answer: Borrow 1 h (60 min) from 8 h, making it 7 h 95 min.
7 h 95 min - 3 h 40 min = 4 h 55 min.
Matching with the decoder, 4 h 55 min corresponds to letter N.
In simple words: Borrow 1 hour (60 minutes) and add it to 35 minutes to get 95 minutes, then subtract.

Exam Tip: Write down the borrowed amounts clearly to avoid calculation mistakes.

Question 8. 7 years 3 months + 3 years 9 months
Answer: 7 years 3 months + 3 years 9 months = 10 years 12 months
Since 12 months = 1 year, adding it to 10 years gives 11 years.
Matching with the decoder, 11 years corresponds to letter E.
In simple words: Add the months, and since 12 months make a full year, convert it and add it to the years.

Answer: Borrow 1 year (12 months) from 8 years, making it 7 years 18 months.
7 years 18 months - 11 months = 7 years 7 months.
Matching with the decoder, 7 years 7 months corresponds to letter L.
In simple words: Borrow 1 year as 12 months and combine it with 6 months to get 18 months before subtracting 11 months.

Exam Tip: Keep track of the reduced year count after borrowing.

Decoded Message (Largest Island in the World):
Arranging the letters according to the solved sequence: G - R - E - E - N - L - A - N - D
The largest island in the world is GREENLAND.