CLASS 5TH MATHS WORKSHEET LESSON 12

Mathematics Worksheet: Time & Units (Preparatory Stage)

Based on NCERT/CBSE and "Racing Seconds" chapter (minutes, seconds, elapsed time, patterns, and practical problems). Try all 30 questions—answers appear with button and each detailed solution is hidden for learning!

Concepts

• How many seconds are there in one minute?
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  Answer: 60 seconds

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  Solution: One minute equals 60 seconds. (NCERT, p. 157)
• What is the smallest unit of time commonly used (in daily life)?
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  Answer: Second

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  Solution: Seconds measure short events like races, blinking, etc.
• What is the duration from 12:30 PM to 1 PM?
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  Answer: 30 minutes

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  Solution: 1:00 PM minus 12:30 PM = 30 minutes
• Which event takes less time: Blinking your eyes or drinking a glass of water?
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  Answer: Blinking eyes

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  Solution: Blinking happens in a second; drinking water takes minutes.
• Write the time in 24-hour format: 02:30 PM.
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  Answer: 14:30 hours

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  Solution: Add 12 to PM hours: 2 + 12 = 14 (NCERT, p. 158)
• What do you call the length of time between start and end of an activity?
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  Answer: Duration or elapsed time

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  Solution: The total time spent is the duration.
• How many minutes in 2 hours?
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  Answer: 120 minutes

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  Solution: 2 × 60 = 120 minutes
• If a child finishes a race at 1 min 55 sec and another at 1 min 56 sec, who wins?
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  Answer: 1 min 55 sec (lesser time wins)

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  Solution: Shorter time means faster completion.
• How do you write 7:30 PM in 24-hour format?
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  Answer: 19:30 hours

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  Solution: 7 + 12 = 19 hours
• How many seconds in 5 minutes?
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  Answer: 300 seconds

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  Solution: 5 × 60 = 300 seconds

Computational Skills

• What is the elapsed time from 08:00 to 09:05?
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  Answer: 1 hour 5 minutes

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  Solution: 09:05 - 08:00 = 1:05
• Convert 75 minutes to hours and minutes.
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  Answer: 1 hour 15 minutes

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  Solution: 75 ÷ 60 = 1 hour; remainder 15 min
• How much time has elapsed: 06:15 PM to 08:00 PM?
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  Answer: 1 hour 45 minutes

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  Solution: 8:00 - 6:15 = 1:45
• Add: 50 min for Maths + 50 min for English + 50 min for Hindi + 50 min for Around Us
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  Answer: 3 hours 20 minutes

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  Solution: 4 × 50 = 200 min; 200 ÷ 60 = 3 hours 20 min
• Jyoti went out at 06:15 PM and played for 1 hr 45 min. When did she return?
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  Answer: 08:00 PM

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  Solution: 6:15 + 1:45 = 8:00 PM
• Convert 150 minutes to hours and minutes.
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  Answer: 2 hours 30 minutes

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  Solution: 150 ÷ 60 = 2 hours; remainder 30 min
• Ragini finished her homework at 09:40 PM; it took 1 hr 10 min. When did she start?
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  Answer: 08:30 PM

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  Solution: 9:40 - 1:10 = 8:30 PM
• Alya goes to play at 05:30 PM, comes back after 1:10. What time is she back?
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  Answer: 06:40 PM

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  Solution: 5:30 + 1:10 = 6:40 PM
• If lunch starts at 12:30 PM and is 35 min long, what time does it end?
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  Answer: 01:05 PM

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  Solution: 12:30 + 0:35 = 1:05 PM
• What time is it 8 hrs 25 min after 08:35 PM?
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  Answer: 05:00 AM (next day)

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  Solution: 08:35 + 8:25 = 17:00; next morning is 5:00 AM

Problem-Solving & Real-World Modeling

• If a child can count to 120 in 1 min, how long for 240?
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  Answer: 2 min

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  Solution: 240 ÷ 120 = 2 min
• If a race starts at 08:00 AM and runners finish at 08:02:03, 08:01:56, and 08:01:55, who is first?
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  Answer: 08:01:55 (least time)

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  Solution: Shortest elapsed time wins.
• What activities can you complete in less than a minute? (Give three)
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  Answer: Blinking, snapping fingers, lifting a book

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  Solution: Estimate by timing—these all take seconds.
• Estimate how many times you can skip rope in 10 seconds.
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  Answer: About 20-30 times

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  Solution: Actual numbers vary, but most can do 2-3 skips/second.
• If Raghav practices yoga from 7:30 AM to 8:05 AM, how much time does he spend?
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  Answer: 35 minutes

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  Solution: 8:05 - 7:30 = 0:35 min
• If you record how long it takes to write FRIEND, and you finish in 12 seconds, how many letters do you write per second?
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  Answer: About 0.58 letters/second

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  Solution: FRIEND has 7 letters, so 7 ÷ 12 ≈ 0.58
• You do 25 push-ups in 1 minute. How many push-ups per second?
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  Answer: About 0.42 push-ups/second

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  Solution: 25 ÷ 60 ≈ 0.42
• If you want to blow 10 balloons in 1 min, how much time (in seconds) should you spend on each?
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  Answer: 6 seconds per balloon

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  Solution: 60 sec ÷ 10 balloons = 6 sec/balloon
• What is the time difference between 4:00 PM and 6:45 PM?
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  Answer: 2 hours 45 minutes

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  Solution: 6:45 - 4:00 = 2:45
• Challenge: A school day starts at 07:30 AM and ends at 02:45 PM. How many hours and minutes is the school day?
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  Answer: 7 hours 15 minutes

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  Solution: 2:45 PM = 14:45; 14:45 - 7:30 = 7:15