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NCERT: Math-Magic Solutions for Class-3, Chapter-7: Time Goes on

Time Goes on with the concept of time. This chapter have exercises on reading calendar, Reading time in hours, chronology of events. The solutions for Math-Magic Chapter-7 have been created and verified by our experienced subject matter experts, according to the CBSE syllabus and guidelines of NCERT. For practice, our subject matter experts have created very interactive, activity-based, and Image-based worksheets on these topics to enhance learning.

Download the NCERT Solutions for Time Goes on in PDF

Time Goes On

Question 1 :

As the sun sets ______Sumana wakes up. What a lovely evening! _______She washes her face fast in 2hours __________and runs out. She goes straight to the bird's nest. She has been watching the eggs for the last few months___________. She was waiting for the baby birds to come out. But before she can blink her eyes, in a week ________ a cat jumps onto the tree. The mother bird cries loudly and Sumana rushes to shoo the cat away. As the cat jumps, it hits the big green mango. Dhum! ... In two days _____________.it is on the ground ! Oh, how sad! The mango is still not fully ripe. It needed one more year ________ to become sweet. Suddenly Sumana's sister calls out — Are you still not hungry? Has your stomach clock gone to sleep? Come and eat hot upma for dinner _____________. Wasn't that funny? You must have guessed that the coloured words are wrong. Choose the correct word from the box given below and write it next to the wrong word.

days   rises   seconds   morning
breakfast   moment   minutes   week
Answer :

As the sun rises Sumana wakes up. What a lovely morning! She washes her face fast in 2 minutes and runs out. She goes straight to the bird's nest. She has been watching the eggs for the last few days. She was waiting for the baby birds to come out. But before she can blink her eyes, in a moment a cat jumps onto the tree. The mother bird cries loudly and Sumana rushes to shoo the cat away. As the cat jumps, it hits the big green mango. Dhum! ... In two >seconds, it is on the ground! Oh, how sad! The mango is still not fully ripe. It needed one more week to become sweet. Suddenly Sumana's sister calls out — Are you still not hungry? Has your stomach clock gone to sleep? Come and eat hot upma for breakfast.


How Long does it Take?

Question 1 :

Think of many different things that can take different times. Make your table as long as you can.

Answer :

There are many tasks you do in a day. Get some ideas from the same. A sample answer is:


Clap! Clap! — Before you Catch

Question 1 :

How many of you can speak and stamp at the same time?

Answer :

Do it by yourself. Most of the people can speak and stamp at the same time.


Question 2 :

Have you heard people playing a tabla or the drums? Find out a few different beats they play. Also ask what 'bols' they say for the beats they play.

Answer :

Do it by yourself as directed. Many people can play tabla or drums. Different beats of tabla are Ektal and Chautal ,Jhaptal (or Japtal), Keherwa, Rupak (Mughlai/Roopak).


How Old are We?

Question 1 :

How Old are We?

Answer :

Do it yourself.


Question 2 :

Irfan's mother is twice as old as him. She is also 20 years older than him. Guess the ages of Irfan and his mother.

Answer :

Since the mother is twice as old as him and he is 20 years old, twice his age will be 40 years. Hence, the age of Irfan’s mother is 40 years.


Question 3 :

How many full moons have passed since you were born?

Answer :

Do it by yourself by discussing it with your parents. The difference between one full moon to another full moon is 30 days or more precisely 29 days, 12 hours, and 44 minutes.


Birth Certificate

Question 1 :

Look at the birth certificate of Bincy.
(1) 2/5/2002 shows that Bincy was born on 2 in the year 2002.
(2) How old will Bincy be on 2 May 2008?
(3) How old will she be in the year 2052?
(4) On what date will she be eight years old? Write in numbers.
(5) How many months old was Bincy on 2 August 2002?
(6) How many years old is Bincy now?
(7) After how many months of her birth was the certificate issued?
(8) What is the registration number of her certificate?

Answer :

(1) 2/5/2002 means 2 May 2002. So, 2/5/2002 shows that Bincy was born on 2nd May 2002.
(2) Subtract 2002 from 2008 to get the number of years from 2002 to 2008.
2008
-2002
6
Hence, Bincy will be 6 years old on 2nd May 2008.
(3) Subtract 2002 from 2052 to get the number of years from 2002 to 2052.
2052
-2002
50
Hence, Bincy will be 50 years old on 2nd May 2052.
(4) Add 8 with 2002 to get the Bincy’s age in 8 years.
2002
+ 8
2010
So, Bincy will be 8 years old on 2nd May 2010.
(5) Since she was born on 2nd May 2002, she will be 3 months old on 2nd August 2002.
(6) From May to December there are 8 months and difference between 2002 to 2021 is 19 years Hence, she is 19 years 8 months old.
(7) She was born on 2nd May 2002 and the certificate was issued on 5th August 2002. Since there are 3 months from May to August, the certificate was issued after 3 months of her birth.
(8) The Registration Number of her certificate is 815/02


Let's Deliver Letters

Question 1 :

When were you born? Write your date of birth in numbers. Do you have a birth certificate? Ask your parents and make one for yourself.