Q1: What is the total number of minutes in 3 hours? (a) 60 minutes (b) 120 minutes (c) 180 minutes (d) 240 minutes
Solution:
Ans: (c) Explanation: Since 1 hour = 60 minutes, we multiply: \(3 \times 60 = 180\) minutes. Option (a) is only 1 hour, option (b) is 2 hours, and option (d) is 4 hours.
Q2: If a movie starts at 2:45 PM and ends at 4:30 PM, how long is the movie? (a) 1 hour 45 minutes (b) 2 hours 15 minutes (c) 1 hour 30 minutes (d) 2 hours 45 minutes
Solution:
Ans: (a) Explanation: From 2:45 PM to 3:00 PM is 15 minutes. From 3:00 PM to 4:30 PM is 1 hour 30 minutes. Adding them together: \(15 + 90 = 105\) minutes or 1 hour 45 minutes. Option (c) doesn't account for the extra 15 minutes.
Q3: How many seconds are in 4 minutes? (a) 120 seconds (b) 180 seconds (c) 240 seconds (d) 400 seconds
Solution:
Ans: (c) Explanation: Since 1 minute = 60 seconds, we calculate: \(4 \times 60 = 240\) seconds. Option (a) is only 2 minutes, option (b) is 3 minutes, and option (d) is an incorrect multiplication.
Q4: Sarah goes to bed at 8:30 PM and wakes up at 6:45 AM. How long did she sleep? (a) 9 hours 15 minutes (b) 10 hours 15 minutes (c) 9 hours 45 minutes (d) 10 hours 45 minutes
Solution:
Ans: (b) Explanation: From 8:30 PM to midnight is 3 hours 30 minutes. From midnight to 6:45 AM is 6 hours 45 minutes. Adding: \(3 \text{ hours } 30 \text{ min} + 6 \text{ hours } 45 \text{ min} = 10 \text{ hours } 15 \text{ minutes}\). Option (a) is a common mistake from incorrect calculation.
Q5: Which unit of time would you use to measure how long it takes to brush your teeth? (a) Seconds (b) Minutes (c) Hours (d) Days
Solution:
Ans: (b) Explanation: Brushing teeth typically takes about 2-3 minutes. Seconds would be too short, and hours or days would be too long for this activity.
Q6: What time will it be 25 minutes after 11:50 AM? (a) 12:15 PM (b) 12:25 PM (c) 11:75 AM (d) 12:05 PM
Solution:
Ans: (a) Explanation: From 11:50 AM, adding 10 minutes gets us to 12:00 PM (noon). Adding the remaining 15 minutes gives us 12:15 PM. Option (c) is not a valid time format, and option (d) only adds 15 minutes.
Q7: How many hours are in 2 days? (a) 12 hours (b) 24 hours (c) 36 hours (d) 48 hours
Solution:
Ans: (d) Explanation: Since 1 day = 24 hours, we calculate: \(2 \times 24 = 48\) hours. Option (b) is only 1 day, and option (c) is 1.5 days.
Q8: A clock shows 7:20. What will the time be 1 hour and 55 minutes later? (a) 8:75 (b) 9:15 (c) 9:25 (d) 8:15
Solution:
Ans: (b) Explanation: Starting at 7:20, adding 1 hour gives us 8:20. Adding 55 minutes: 8:20 + 40 minutes = 9:00, then + 15 more minutes = 9:15. Option (a) is not a valid time format.
Section B: Fill in the Blanks
Q9: There are __________ minutes in half an hour.
Solution:
Ans: 30 Explanation: Since 1 hour = 60 minutes, half an hour = \(60 \div 2 = 30\) minutes.
Q10: The short hand on a clock shows the __________, and the long hand shows the __________.
Solution:
Ans: hour, minutes Explanation: The short hand (hour hand) points to the hour, and the long hand (minute hand) points to the minutes on a clock.
Q11: If it is 3:00 PM now, it will be 3:00 AM in __________ hours.
Solution:
Ans: 12 Explanation: From 3:00 PM to 3:00 AM is exactly 12 hours, as this represents half a day.
Q12: There are __________ days in 3 weeks.
Solution:
Ans: 21 Explanation: Since 1 week = 7 days, we calculate: \(3 \times 7 = 21\) days.
Q13: The time 45 minutes before 1:00 PM is __________.
Solution:
Ans: 12:15 PM Explanation: Subtracting 45 minutes from 1:00 PM means going back to 12:15 PM (15 minutes after noon).
Q14: When the minute hand is on the 6, it shows __________ minutes past the hour.
Solution:
Ans: 30 Explanation: The minute hand on the 6 indicates half past the hour, which is 30 minutes.
Section C: Word Problems
Q15: A soccer practice starts at 3:15 PM and lasts for 1 hour and 20 minutes. What time does practice end?
Q16: Emma started reading at 6:40 PM and finished at 7:25 PM. How many minutes did she read?
Solution:
Ans: Step 1: From 6:40 PM to 7:00 PM = 20 minutes Step 2: From 7:00 PM to 7:25 PM = 25 minutes Step 3: Total time = \(20 + 25 = 45\) minutes Final Answer: 45 minutes
Q17: A train journey takes 2 hours and 35 minutes. If the train departs at 9:50 AM, what time will it arrive?
Solution:
Ans: Step 1: Starting time is 9:50 AM Step 2: Add 2 hours: 9:50 AM + 2 hours = 11:50 AM Step 3: Add 35 minutes: 11:50 AM + 10 minutes = 12:00 PM, then + 25 minutes = 12:25 PM Final Answer: 12:25 PM
Q18: Michael practices piano for 25 minutes every day. How many minutes does he practice in 5 days?
Solution:
Ans: Step 1: Minutes per day = 25 minutes Step 2: Number of days = 5 Step 3: Total minutes = \(25 \times 5 = 125\) minutes Final Answer: 125 minutes
Q19: A baking recipe says to bake cookies for 18 minutes. If you put them in the oven at 2:47 PM, what time should you take them out?
Solution:
Ans: Step 1: Starting time is 2:47 PM Step 2: Add 13 minutes to reach 3:00 PM Step 3: Add remaining 5 minutes: 3:00 PM + 5 minutes = 3:05 PM Final Answer: 3:05 PM
Q20: A school day starts at 8:30 AM and ends at 3:15 PM. There is a 45-minute lunch break. How many hours and minutes of class time are there (not including lunch)?
Solution:
Ans: Step 1: Total time from 8:30 AM to 3:15 PM = 6 hours 45 minutes Step 2: Subtract lunch break: 6 hours 45 minutes - 45 minutes = 6 hours Final Answer: 6 hours
The document Worksheet (with Solutions): Time is a part of the Grade 4 Course Math Grade 4.
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