Time Goes On explores calendars, ages and clocks—starting with a calendar missing the month of July, reading a birth certificate, and tracking how long everyday activities take. Students complete monthly calendars, calculate dates and vacation lengths, find ages from birth years, and read hours and minutes on analogue clocks.
What Class 3 Mathematics Chapter 13 Covers
Reading and Making a Calendar: Finding days of the week, counting Sundays and calculating dates before and after
Months of the Year and Festivals: Ordering the 12 months and matching festivals to seasons and dates
Reading a Birth Certificate: Finding date, month and year of birth and calculating age in years
Clocks and Duration: Distinguishing activities that take seconds, minutes, hours, days or months, and reading time on a clock face
Exercises in Chapter 13
- Let us Do & Let us Explore (Pages 165–170): Complete the July calendar, answer date questions and read Kusum’s birth certificate.
- Let us Play & Let us Think (Pages 171–176): Compare ages in a family, read clock times during a visit to Nani’s house and estimate activity durations.
Read Class 3 Mathematics Chapter 13 Online
More Chapters
- Previous: Chapter 12: Give and Take
- Next: Chapter 14: The Surajkund Fair
- Hindi medium: Class 3 Maths Chapter 13 PDF in Hindi (Ganit Mela)
- All Mathematics chapters and the other Class 3 books: Class 3 NCERT books 2026-27
- All Class 1 to 12 NCERT Textbooks: NCERT Books PDF (Class 1–12)
- Every book chapter by chapter: NCERT chapter wise PDF
FAQ
How many days are there in July and January?
Both July and January have 31 days.
If a school closes on July 7 for 15 days, how do you find the reopening date?
Count 15 days from July 7 (July 7 to July 21 is 15 days), so the school reopens on July 22.