NCERT Solutions for Class 3 Maths Chapter 13 Time Goes On

Exercise 13: Time Goes On

Question. Make the calendar for the month of July 2024. Observe the July month and complete the following.
1. Number of Sundays
2. Write the dates in this month that are Thursdays
3. Three days after July 22 is July ___________. The day on this date is ___________
4. A school closes on July 7 for 15 days. The date on which the school will open is ___________
Answer:
July 2024 Calendar Table:

Completed sentences:
1. Number of Sundays: Four
2. Thursdays fall on these dates: 4, 11, 18, and 25
3. Three days after July 22 are July 25, 26, and 27. The days on these dates are Thursday, Friday, and Saturday.
4. The school will reopen on 22 July.
In simple words: We can make a calendar to see days and dates. It helps us count weeks, spot Sundays, and find out when school starts again.

Exam Tip: To find the reopening date, add the number of holidays directly to the closing date: \( 7 + 15 = 22 \).

Question. Collect calendars for the last two years. Observe the following in both the calendars: What is the same? What is changing in the years? Tick the correct answer. Circle the festivals that fall on the same date.
(a) Names of the months: Same / Changes
(b) Days in a month: Same / Changes
(c) Days in a week: Same / Changes
(d) Number of Sundays: Same / Changes
(e) Number of weeks in a year: Same / Changes
Answer:
1. Ticked Options:
- (a) Names of the months: Same [Ticked]
- (b) Days in a month: Changes [Ticked] (since leap years change February)
- (c) Days in a week: Same [Ticked]
- (d) Number of Sundays: Changes [Ticked]
- (e) Number of weeks in a year: Same [Ticked]

2. Sample Festival Dates (2023 vs 2024):

Note: Festivals with an asterisk (*) fall on the same date every year.
In simple words: Some things on a calendar never change, like month names and the seven days of the week. Some celebrations, like Christmas and Republic Day, stay on the same date every year.

Exam Tip: National holidays like Republic Day (26 Jan) and Independence Day (15 Aug) always stay on the same date every year.

Question 1. Write the names of the 12 months in a year.
Answer: The twelve months of the year are January, February, March, April, May, June, July, August, September, October, November, and December.
In simple words: There are 12 months in every year, starting with January and ending with December.

Exam Tip: Practice spelling the months correctly, especially February, Wednesday, and September, as they can be tricky.

Question 2. Months that have less than 30 days
Answer: Only February has less than 30 days. It has 28 days in a normal year and 29 days in a leap year.
In simple words: February is the shortest month of the year with only 28 or 29 days.

Exam Tip: February is the only month in the entire calendar that has less than 30 days.

Question 3. Number of days in a year.
Answer: A normal year has 365 days, and a leap year has 366 days.
In simple words: A regular year is 365 days long, but a leap year has one extra day.

Exam Tip: A leap year occurs once every four years and adds an extra day to February.

Question 4. Hetal says there are 53 weeks in a year. is she right? Yes/No. If not, how many weeks did you find in a year?
Answer: No, Hetal is not correct. There are 52 weeks in a year.
In simple words: A year has 52 full weeks, not 53.

Exam Tip: Dividing 365 days by 7 days per week gives 52 weeks with 1 day left over.

Question. Talk to your mother and find the following (Age Fun).
Answer:
The completed ages in the chart are:
- My age today: 8 years
- My mother's age today: 33 years
- My mother's age when I was born: 25 years (33 - 8 = 25)
- Age of my mother's mother when my mother was born: 23 years
- Age of my mother's mother when I was born: 47 years
- Age of my mother's mother today: 58 years
In simple words: We can find family ages by subtracting. For example, subtracting my age from my mother's age shows how old she was when I was born.

Exam Tip: The difference between two people's ages always stays the exact same throughout their lives.

Question. Hetal is twice as old as her brother. She is also 10 years older than her brother. Guess the age of Hetal and her brother.
Answer: Hetal is 20 years old and her brother is 10 years old.
In simple words: Since 20 is twice as much as 10, and also 10 more than 10, Hetal must be 20 and her brother must be 10.

Exam Tip: Test your answer: 20 is double of 10, and \( 20 - 10 = 10 \), so both clues are correct.

Question. Hetal says there are 53 weeks in a year. is she right? Yes/No. If not, how many weeks did you find in a year?
Answer: No, she is not correct. There are 52 weeks and one day in a normal year.
In simple words: There are 52 weeks and 1 day in a standard year.

Exam Tip: Remember that a leap year has 52 weeks and 2 extra days.

Question. Look at the birth certificate of Bincy and answer the following question.
1. 2/5/2015 shows that Bincy was born on 2 (April/May/June/July) in the year 2015.
2. How old will Bincy be on 2 May 2025?
3. How old will she be in 2030?
4. Eighth Birthday of Bincy was on _____________.
5. Bincy was _____________ months old on 2 August 2015.
6. After how many days of her birth was the certificate issued? _____________
Answer:
1. 2/5/2015 shows that Bincy was born on 2 May [Ticked] in the year 2015.
2. Bincy will be 10 Years old on 2 May 2025.
3. She will be 15 Years old in the year 2030.
4. The eighth birthday of Bincy was on 2 May 2023.
5. Bincy was 3 months old on 2 August 2015 (from May to August is 3 months).
6. The certificate was issued after 16 days (from 2 May to 18 May is 16 days).
In simple words: We can read Bincy's birth certificate to find her birthday, calculate her age in different years, and see when she got her certificate.

Exam Tip: The fifth month "5" in a date always represents May. Count forward from May to find ages or months passed.

Question 1. Make your own birth certificate.
Answer:
Sample Birth Certificate:
- Name: Aryan
- Sex: Male
- Date of Birth: June 21, 2016
- Place of Birth: MCD Hospital
- Name of Father: Satya Narayan Sharma
- Name of Mother: Mohita
- Date of Making Certificate: June 26, 2016
- Age on the date of making the certificate: 5 Days
In simple words: This is a sample birth certificate showing a child's name, parent's names, where they were born, and their birth date.

Exam Tip: Ask your parents to show you your real birth certificate so you can fill in your own actual details.

Question 2. Complete the following by writing the dates in the boxes given below:
Answer:

In simple words: This table lists important school dates for a child born on June 21, 2016, showing when they started school and entered different classes.

Exam Tip: Notice how the years increase as you move from nursery to Class I and Class III.

Question 1. Hetal started her breakfast at 7 o'clock in the morning. She finished her breakfast at 07:15 in the morning. She took _____________ minutes to eat her breakfast. How do you know?
Answer: She took 15 minutes to eat her breakfast. We can find this by subtracting 7:00 from 7:15.
In simple words: Subtracting the start time from the end time shows it took 15 minutes to eat.

Exam Tip: Each single number on a clock face represents 5 minutes. The minute hand moved from 12 to 3, which is 15 minutes.

Question 2. Draw the hour hand and minute hand on the clock to show the following:
(a) 8:15 or quarter past 8
(b) 8:30 or half past 8
Answer:
- (a) For 8:15: Draw the short hour hand pointing slightly past 8, and the long minute hand pointing exactly at 3.
- (b) For 8:30: Draw the short hour hand pointing halfway between 8 and 9, and the long minute hand pointing exactly at 6.
In simple words: To show 8:15, put the minute hand on 3. To show 8:30, put the minute hand on 6, and the hour hand halfway between 8 and 9.

Exam Tip: Remember that as the minute hand moves, the hour hand also crawls slowly toward the next number.

Question 1. A Day in the life of Hetal. Match the activity with the statement shown in the picture. Write the time and draw the minute hand and the hour hand wherever it is required.
Answer:
Hetal's daily activities matched with their times:
- Wakes up: 6 o'clock (6:00)
- Does yoga: 7 o'clock (7:00)
- Goes to School: 8 o'clock (8:00)
- Returns to home: 1 o'clock (1:00)
- Haves Lunch: 2 o'clock (2:00)
- Plays: 4 o'clock (4:00)
- Studies: 5 o'clock (5:00)
- Goes to Sleep: 9 o'clock (9:00)
In simple words: We match each of Hetal's daily habits, like waking up, studying, and playing, to the correct clock times.

Exam Tip: Standard daily routines follow a logical order, starting from waking up in the morning and ending with sleeping at night.

Question 2. Fill the table by writing events or activities from your daily life that can take the following durations of time. One is written as an example in each column.
Answer:

In simple words: This table groups things we do by how long they take. Building a house takes months, but drinking water takes just a few minutes.

Exam Tip: Think about your own schedule to find other fun examples for each column of time.

Question 3. Write the number of minutes taken for the following activities.
Answer:

In simple words: Brushing teeth is very quick (5 minutes), but a school period takes much longer (40 minutes).

Exam Tip: These are typical times for school and home habits. Your own times might vary slightly.

Question 4. Write down what you can do in the time frame given below.
Answer:

In simple words: This list shows how much we can achieve in different periods of time, like doing homework in 30 minutes.

Exam Tip: Planning your tasks using these time blocks helps you manage your day much better.

Question 5. Write the number of minutes passed by looking at the movement of the minute and hour hands.
Answer:

In simple words: We find how much time passed by looking at where the clock hands started and where they stopped.

Exam Tip: If the minute hand goes all the way around the clock once, exactly one hour (60 minutes) has passed.

Question 1. What is the difference between the above two clocks?
Answer: A digital clock shows the time using numbers. An analog clock uses hands that point to numbers around a circle.
In simple words: Digital clocks use numbers to show time, while analog clocks use moving hands.

Exam Tip: Analog clocks use three hands (seconds, minutes, and hours) to show time, while digital clocks display numbers directly on a screen.

Question 2. Which clock do you have on your school wall?
Answer: We have an analog clock on our classroom wall.
In simple words: Our school wall has a round clock with pointing hands.

Exam Tip: Most schools use analog clocks because they help children practice reading clock hands easily.