Chapter 13 of 14

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Andhra Pradesh (BIEAP)Class 3 Mathematics★ 3-4 marks through school tests, activities, notebook work, and competency questions in CBSE Class 3 Mathematics (Maths Mela)

Time Goes On

A CBSE Class 3 Mathematics (Maths Mela) chapter on time — reading clocks, using the units of time, and reading a calendar. Children learn o'clock and half past, the days of the week, the months of the year, and how the units of time fit together. These notes give core ideas, worked examples, an activity, common mistakes, a practice set with answers, and quick revision.

⏱ 16 min readEasy difficulty✓ Free · NCERT-aligned

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The chapter at a glance

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Study Guide

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Key points, glossary and the questions most likely to show up.

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By the end of this chapter you'll be able to…

1Name the units of time and how they relate
2Read o'clock and half past on a clock
3Tell the hour hand from the minute hand
4Read days, dates, and months on a calendar
5Solve simple time questions

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Why this chapter matters

Time Goes On teaches children to read clocks and calendars and to use the units of time. Telling o'clock and half past, knowing the days of the week and months of the year, and understanding how time units fit together build everyday independence.

Before you start — revise these

A 5-minute refresher here will save you 30 minutes of confusion below.

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Sequencing and numbers to 60

Counting to 60 and ordering events.

Time Goes On — Class 3 Mathematics (CBSE)

From the current NCERT Maths Mela Grade 3 book, Chapter 13. Clocks and calendars help us tell time and plan our day.

1. Why this chapter matters

Time runs our day — when we wake, study, eat, and sleep. Learning to read a clock and a calendar, and to know how seconds, minutes, hours, days, and months fit together, helps children become organised and independent.

2. Core ideas

Idea 1 — The units of time

60 seconds = 1 minute, 60 minutes = 1 hour, 24 hours = 1 day, 7 days = 1 week, 12 months = 1 year.

Method 2 — Read the clock

The short hand shows the hour; the long hand shows the minutes. Long hand on 12 = o'clock; on 6 = half past.

Skill 3 — Read the calendar

A calendar shows the days of the week and the months of the year, and helps us find dates.

3. Worked examples

Example 1: The short hand is on 3 and the long hand on 12. What time is it?

It is 3 o'clock.

Example 2: The short hand is between 4 and 5, the long hand on 6. What time?

It is half past 4 (4:30).

Example 3: How many days are there in a week, and how many months in a year?

7 days in a week and 12 months in a year.

4. Activity corner

Make a paper clock with two hands. Set it to show 2 o'clock, half past 7, and your school start time. Then circle today's date on a calendar. Write:

The times I showed
Today's day and date
The maths idea (reading clocks and calendars)

5. Common mistakes

Mistake: Mixing up the hour hand and the minute hand. Fix: The short hand = hour, the long hand = minutes.
Mistake: Saying "half past" without moving the hour hand. Fix: At half past, the hour hand sits between two numbers.
Mistake: Forgetting the number of days or months. Fix: Remember 7 days in a week and 12 months in a year.

6. How to write better answers

Look at the short hand for the hour.
Look at the long hand for o'clock or half past.
For the calendar, find the day, date, and month.
Use the correct unit (minutes, hours, days).

7. Practice set

How many minutes are there in one hour?
The short hand is on 8 and the long hand on 12. What time is it?
How many days are there in one week?
How many months are there in one year?
What time is half past 6?
How many hours are there in one day?

8. Answer key

60 minutes in one hour.
8 o'clock.
7 days in one week.
12 months in one year.
Half past 6 is 6:30.
24 hours in one day.

9. Quick revision

60 seconds = 1 minute; 60 minutes = 1 hour; 24 hours = 1 day.
7 days = 1 week; 12 months = 1 year.
Short hand = hour; long hand = minutes.
Long hand on 12 = o'clock; on 6 = half past.
A calendar shows days, dates, and months.

Key formulas & results

Everything you need to memorise, in one card. Screenshot this for revision.

Core idea

60 seconds = 1 minute; 60 minutes = 1 hour; 24 hours = 1 day; 7 days = 1 week; 12 months = 1 year.

These units fit together in fixed amounts.

Math move

Short hand shows the hour; long hand shows the minutes.

Long hand on 12 is o'clock; on 6 is half past.

Exam habit

A calendar shows the days of the week and the months of the year.

Use it to find days and dates.

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Common mistakes & fixes

These are the exact errors that cost students marks in board exams. Read them once, save yourself the trouble.

WATCH OUT

✗ Mixing up the hour hand and the minute hand

✓ The short hand shows the hour; the long hand shows the minutes.

WATCH OUT

✗ Saying half past without moving the hour hand

✓ At half past, the hour hand sits between two numbers.

WATCH OUT

✗ Forgetting the number of days or months

✓ Remember 7 days in a week and 12 months in a year.

NCERT exercises

Every NCERT exercise from this chapter — what it covers and how many questions to expect.

Read, observe, and discuss

Read clock faces and a calendar from the textbook, and discuss daily routines before writing answers.

Questions

Notebook practice

Telling o'clock and half past, recalling time units, and reading days and months.

Questions

Project or activity

Make a paper clock, show three times, and circle today's date on a calendar.

Questions

Practice problems

Work through this chapter's problems as a readiness check — reveal each solution, mark yourself honestly, and get your gap report at the end.

Readiness check

Are you exam-ready for Time Goes On?

6 problems from this chapter. Try each one, reveal the worked solution, mark yourself honestly — get your gap report at the end.

6 questions~4 min worth ~4 marks in Andhra Pradesh (BIEAP) exams

5-minute revision

The whole chapter, distilled. Read this the night before the exam.

•Time Goes On is Chapter 13 of the Class 3 Maths Mela textbook.
•60 seconds = 1 minute; 60 minutes = 1 hour; 24 hours = 1 day.
•7 days = 1 week; 12 months = 1 year.
•Short hand = hour; long hand = minutes.
•Long hand on 12 = o'clock; on 6 = half past.
•A calendar shows days, dates, and months.

Andhra Pradesh (BIEAP) marks blueprint

Where the marks come from in this chapter — so you can plan your prep.

Typical chapter weightage: 3-4 marks in school tests, oral checks, notebooks, and activities

Question type	Marks each	Typical count	What it tests
Very Short	1	2-3	Time units, o'clock readings, days, or months
Short Answer	2	1-2	Half past readings or relating time units
Activity / Project	3	0-1	Making a clock and reading a calendar

Prep strategy

Practise reading o'clock and half past on a clock
Learn the units of time and how they connect
Recite the days of the week and months of the year
Use a calendar to find dates

Where this shows up in the real world

This chapter isn't just an exam topic — it lives in the world around you.

Planning the day

Reading a clock helps children follow timetables and routines.

Using a calendar

Finding days and dates helps plan holidays, birthdays, and events.

Being on time

Knowing time units builds punctuality and independence.

Exam strategy

Battle-tested tips from teachers and toppers for this chapter.

Underline the command word: what time, how many, or which day

Read the short hand first for the hour

Use the right unit (minutes, hours, days)

For half past, place the minute hand on 6

Going beyond the textbook

For olympiad aspirants and curious learners — topics that build on this chapter.

STRETCH

If school starts at 8 o'clock and lasts 5 hours, when does it end?

STRETCH

Name the month that comes two months after September.

Where else this chapter is tested

CBSE board isn't the only one — other exams test this chapter too.

CBSE Class 3 School AssessmentHigh

Class 3 Foundation / Olympiad PracticeMedium

Notebook and Activity EvaluationHigh

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Questions students ask

The real ones — pulled from the Q&A community and tutor sessions.

The short hand is the hour hand and the long hand is the minute hand. When the long hand points to 12, it is o'clock.

Half past means 30 minutes after the hour. The minute hand points to 6 and the hour hand sits between two numbers.

Practice more, ask doubts, find a tutor

Andhra Pradesh (BIEAP) Class 3 mock tests

Andhra Pradesh (BIEAP) Class 3 PYQs

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Mathematics flashcards

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