NCERT Solutions for Class 3 Mathematics Chapter 13 Time Goes On

This worksheet provides accurate NCERT Solutions for Class 3 Mathematics Chapter 13, titled Time Goes On[cite: 370]. The chapter introduces students to the essential concepts of measuring time, understanding calendars, and recognizing the duration of different activities in daily life[cite: 372, 455]. It is important for students because it helps them develop a sense of time management and an understanding of chronological order[cite: 417, 442]. This worksheet ensures that students can access complete solutions strictly based on the NCERT curriculum to strengthen their foundational math skills[cite: 369].

Chapter summary: stories, poems & themes

The chapter is a picture-based and activity-based module that focuses on how time passes[cite: 372, 455]. Through visual examples and practical tasks, students learn to distinguish between activities that take seconds, minutes, hours, or days[cite: 455]. The themes of the chapter center around daily routines, such as Hetal's daily schedule, and understanding life events like age calculations and birth certificates[cite: 400, 405, 447]. Students are encouraged to engage in practical observations of clocks and calendars to relate mathematical time to their personal experiences[cite: 373, 414, 474].

What this NCERT chapter covers?

The learning focus of this chapter includes:
• Understanding units of time such as minutes, hours, days, weeks, months, and years[cite: 455].
• Developing observation skills to estimate the duration of various tasks, from brushing teeth to growing crops[cite: 455].
• Learning how to use a calendar to identify dates, specific days of the week, and holiday schedules[cite: 372, 373].
• Understanding the mechanics of a clock, including the differences between hour and minute hands[cite: 414, 415, 416].
• Practical application of time concepts through age-related problems and birth certificate analysis[cite: 400, 405].
• Distinguishing between digital and analog time-telling methods[cite: 475].

How to use these NCERT solutions?

Students should attempt to observe their own daily schedules and estimate time durations for their school activities before checking the answers provided in these solutions[cite: 459]. Parents and teachers can use this guide to help children understand the relationship between different time units, such as how one full trip of the minute hand equals one hour[cite: 444]. These solutions follow the NCERT order and structure to provide a seamless learning experience[cite: 369]. This systematic approach helps students in revision and ensures they are well-prepared for school assessments[cite: 485].

Student tips & learning tricks

• Remember the "short = slow" rule for the hour hand and "long = fast" rule for the minute hand to easily tell time on an analog clock[cite: 416].
• Use the "big numbers" (1 to 12) on a clock to identify hours and the "tiny marks" to identify minutes (1 to 60)[cite: 443].
• Practice using a calendar by looking for patterns, such as identifying that the names of months and days in a week stay the same every year while the number of Sundays changes[cite: 381, 383, 384].
• Learn to estimate durations by categorizing tasks into those that take minutes (like tying shoelaces) versus those that take months (like changing seasons)[cite: 455].

Why NCERT solutions are important?

NCERT-aligned solutions are vital because they provide a standardized path for learning that matches school examinations[cite: 485]. Strong foundational learning in time-related concepts is essential for more advanced math and science topics in higher grades. These solutions improve student confidence and readiness by offering clear explanations and accurate answers tailored for Grade 3 learners[cite: 368, 369].

Complete answer key – NCERT solutions

Let us Do (July Month)
1. Number of Sundays = 4 [cite: 377]
2. Thursdays = 4, 11, 18, 25 [cite: 378]
3. Three days after July 22 = July 25, Day = Thursday [cite: 379]
4. School reopens on = July 22 [cite: 379]

Let Us Explore
1. Names of months → Same [cite: 381]
2. Days in a month → Same [cite: 382]
3. Days in a week → Same [cite: 383]
4. Number of Sundays → Changes [cite: 384]
5. Number of weeks in a year → Changes [cite: 385]

Festivals
1. Independence Day: 15/08/YY [cite: 387]
2. Republic Day: 26/01/YY [cite: 388]
3. Christmas: 25/12/YY [cite: 389]

Let Us Do (Months)
1. List of months: January, February, March, April, May, June, July, August, September, October, November, December [cite: 392]
2. Month with less than 30 days → February [cite: 393]
3. Number of days in a year → 365 days (366 in leap year) [cite: 394]
4. Weeks in a year → 52 weeks and 1 day (2 days in leap year). Hetal is not correct[cite: 396, 397].

Age Fun
1. Hetal is 20 years old and her brother is 10 years old (Calculation: h=2b, h=b+10; 2b=b+10, so b=10 and h=20)[cite: 401, 404].

Let Us Do (Birth Certificate)
1. Month = May [cite: 406]
2. Age on 2 May 2025 = 10 years [cite: 407]
3. Age in 2030 = 15 years [cite: 408]
4. 8th birthday = 02/05/2023 [cite: 409]
5. Age on 2 August 2015 = 3 months [cite: 410]
6. Certificate issued after = 16 days [cite: 410]

Let Us Do (Personal Details)
1. student-generated activity [cite: 412]

Let Us Play (Clock Hands)
1. Short hand = hour hand (moves slowly) [cite: 414]
2. Long hand = minute hand (moves faster) [cite: 415]
3. Minute hand full circle = 1 hour [cite: 417]
4. Hour hand full trip = 12 hours [cite: 417]

Let Us Do (Reading Clocks)
1. Time shown as 8:15: 15 minutes have passed because the minute hand moved from 12 to 3[cite: 421, 434].
2. Time shown as 8:30[cite: 437].

Let us Do (A Day in the life of Hetal)
1. Wakes up → 6 o'clock [cite: 448]
2. Does yoga → 7 o'clock [cite: 448]
3. Goes to school → 8 o'clock [cite: 448]
4. Returns home → 1 o'clock [cite: 449]
5. Lunch → 2 o'clock [cite: 450]
6. Plays → 4 o'clock [cite: 451]
7. Studies → 5 o'clock [cite: 452]
8. Goes to sleep → 9 o'clock [cite: 453]

Let us Think (Duration Table)
1. Takes Minutes: Brushing teeth, making tea, tying shoelaces, sending an email, taking a shower[cite: 455].
2. Takes Hours: Taking a shower, cooking dinner, washing a heavy blanket, watching a movie, traveling to a nearby city[cite: 455].
3. Takes Days: Stitching a shirt, building a birdhouse, painting a room, planning a weekend trip, planting a small garden[cite: 455].
4. Takes Weeks: Completing a school chapter, knitting a sweater, finishing a thick book, organizing a party, renovating a room[cite: 455].
5. Takes Months: Changing from summer to winter, growing crops (wheat), learning a language, building a house, developing a new skill[cite: 455].

Let us Do (Estimations)
1. Estimation of school activity time: student-generated activity[cite: 459].
2. Examples of activities in time frames:
   • 5 minutes → Brushing teeth [cite: 462]
   • 10 minutes → Getting ready [cite: 463]
   • 30 minutes → Lunch [cite: 464]
   • 60 minutes → student-generated activity [cite: 465]

Homework
1. Minutes passed: 5 minutes, 10 minutes, 2 hrs 10 min, 30 min, 1 hr (60 min), 1 hr (60 min)[cite: 467, 468, 469, 470, 471, 472, 473].

Let us Explore (Clocks)
1. Difference: Digital clock shows digits; analog clock uses hands[cite: 475].
2. Classroom clock identification: student-generated activity[cite: 476].

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