## NCERT Class 4 Maths Chapter 2 Long and Short

**NCERT book Page No: 14**

**Question: 1**

**Look at the picture and explain how Birbal made Akbar’s line shorter.**

**Answer: **Birbal drew a longer line than the line drawn by the Akbar.

**see also: MCQ on Long and Short**

**Question: 2**

**Make her right arm 1 cm longer than the left arm.**

**Answer:**

**Question: 3**

**Draw a cup 1 cm shorter than this cup.**

**Answer: The cup drawn is 1 cm shorter than the given cup**

**Question: 4**

**Draw a broom half as long as this broom.**

**Answer: **A broom half of the size of broom given in figure is drawn below

**Question: 5**

**Draw another hair of double the length.**

**Answer: **Hair of double length is drawn below

**NCERT book Page No: 15**

**How Tall Have You Grown?**

**Question: 6**

**Do you remember that in Class 3 you measured your height?**

**Answer: **Yes, I measured my height in Class 3

**Question: 7**

**Do you think you have grown taller?**

**Answer: **Yes, I have grown taller

**Question: 8**

**How much?**

**Answer: **About 5 cm

**Question: 9**

**Have your friends also grown taller?**

**Answer: **Yes, most of them have grown taller

**Question: 10**

**Jhumpa once read a list of the tallest people in the world. One of them was 272 cm tall! That is just double of Jhumpa’s height. How tall is Jhumpa? __________ cm.**

**Answer: **Height of the tallest person = 272 cm

Which is double than Jhumpa’s height

So,

272 ÷ 2 = 136 cm

Hence, Jhumpa’s height is 136 cm

**Question: 11**

**Could that person pass through the door of your classroom without bending?**

**Answer: **Since, the door of the classroom is 230 cm high. So, the person cannot pass through it without bending.

**Question: 12**

**Will his head touch the roof of your house if he stands straight?**

**Answer: **Yes, because the height of my classroom is 310 cm

**The Long and Short of Your Family!**

**Question: 13**

**Who is the tallest in your family?**

**Answer: **My father is the tallest in my family. His height is 174 cm

**Question: 14**

**Who is the shortest in your family?**

**Answer: **My brother is the shortest in my family. His height is 93 cm

**Question: 15**

**What is the difference between their heights?**

**Answer: **The difference between their heights is 81 cm

**NCERT book Page No: 16**

**Race**

**Question: 16**

**(a) How far is Rehana from Arundhati?**

**Answer: **The distance of Rehana from Arundhati is 3 metres.

**(b) How far ahead is Rehana from Konkana and Uma?**

**Answer: **Rehana is 6 metres ahead from Konkana and Uma

**(c) How far are Konkana and Uma from the finishing line?**

**Answer: **Konkana and Uma are 15 metres far from the finishing line

**Question: 17**

**Have you heard about a 1500 m or 3000 m race? (You remember that 1000 metres make 1 kilometre and 500 metres make half a kilometre.)**

**(a) In a 1500 metres race people run ______ km**

**Answer: **In a 1500 metres race people run one and half km

**(b) In a 3000 metres race people run _______ km**

**Answer: **In a 3000 metres race people run 3 km

**NCERT book Page No: 17**

**Question: 18**

**Have you heard about marathon races in which people have to run about 40 kilometres? People run marathons on roads because the track of a stadium is only 400 metres.**

**(a) 10 rounds of a stadium track = ________ km**

**Answer: **10 rounds of a stadium track = 400 metres × 10

= 4000 metres

= 400 ÷ 1000

= 4 km

So, 10 rounds of a stadium track = 4 km

**(b) So, if you run a marathon on a stadium track, you will have to complete rounds!**

**Answer: **The number of rounds to be completed

= (40 × 100) ÷ 100

= 4000 ÷ 100

= 10

Hence, you have to complete 10 rounds on a stadium track

**Question: 19**

**Dhanu has the longest jump of 3 metres 40 cm. Gurjeet is second. His jump is 20 cm less than Dhanu’s. Gopi comes third. His jump is only 5 cm less than Gurjeet’s jump.**

**How long are Gurjeet’s and Gopi’s jumps?**

**Answer: **Gurjeet’s jumps = Dhanu’s jump – 20 cm

= 3 metres 40 cm – 20 cm

= 3 metres 20 cm

Therefore, Gurjeet’s jump is 3 metres 20 cm

Gopi’s jump = Gurjeet’s jumps – 5 cm

= 3 metres 20 cm – 5 cm

= 3 metres 15 cm

Therefore, Gopi’s jump is 3 metres 15 cm

**Question: 20**

**Find out from the table**

**1. How many centimetres more should Chandra Pal jump to equal the Men’s World Record for high jump?**

**Answer: **We know that,

1 m = 100 cm

Given

Men’s world record for high jump = 2 m 45 cm

= 2 × 100 + 45 cm

= 200 cm + 45 cm

= 245 cm

High jump record of Chandra Pal = 2 m 17 cm

= 2 × 100 + 17 cm

= 200 cm + 17 cm

= 217 cm

Now, subtract 217 from 245, we get

245 – 217 = 28 cm

Hence, to equal the men’s world record for high jump, Chandra Pal need to jump 28 cm more.

**2. How many centimetres higher should Bobby A jump to reach 2 metres?**

**Remember that 1 m = 100 cm**

**Half metre =?**

**Answer: **Bobby A, high jump record = 1 m 91 cm

= 1 × 100 + 91 cm

= 191 cm

Required centimetres to reach is 2m

So,

= 2 × 100

= 200 cm

Thus,

200 – 191 = 9 cm

Therefore, Bobby A should jump 9 cm higher to reach 2 metres

**3. Galina’s long jump is nearly**

**(a) 7 metres**

**(b) 7 and a half metres**

**(c) 8 metres**

**Answer: **Galina’s long jump record is 7 m 52 cm

Hence, it is nearly 7 and half metres,

Therefore option (b) is correct

**4. Look at the Women’s World Records. What is the difference between the longest jump and the highest jump?**

**Answer: **Women’s World record for high jump = 2 m 9 cm

Women’s World record for long jump = 7 m 52 cm

So, difference between them is

= 7 m 52 cm – 2 m 9 cm

= 5 m 43 cm

**5. If Mike P, could jump _______ centimetres longer, his jump would be full 9 metres.**

**Answer: **Mike P long jump record = 8 m 95 cm

To reach 9 metres = 9 m – 8 m 95 cm

= 5 cm

Therefore, if Mike P jump 5 cm longer, his jump would be full 9 metres

**6. Whose high jump is very close to two and half metres?**

**(a) Stefka K.**

**(b) Chandra Pal**

**(c) Javier S.**

**(d) Bobby A.**

**Answer: **Javier S high jump is 2 m 45 cm. So, his jump is very close to two and half metres.

**NCERT book Page No: 19**

**Question: 21**

*** How many rounds of the park must Devi Prasad run to complete 2 km?**

**Answer: **We know that,

1 km = 1000 m

So,

2 km = 2000 m

Hence, to complete 2000 m, Devi Prasad must complete

= 2000 m ÷ 400 m

= 5 rounds

Therefore, Devi Prasad has to complete 5 rounds of the park

*** One day the weather was very good and a cool breeze was blowing. He felt so good that he kept jogging till he got tired after 8 rounds. That day he ran _______ km and _________ metres!**

**Answer: **Distance covered to complete one round of the park = 400 m

So, distance covered by Devi Prasad to complete 8 rounds of the park = 400 m × 8

= 3200 m

We know,

1000 m = 1 km

Therefore, 3200 m = 3000 m + 200 m

3000 m = 3000 ÷ 1000

= 3 km 200 m

Hence, Devi Prasad ran 3 km 200 m to complete 8 rounds of the park

**NCERT book Page No: 20**

**From Kozhikode to Thalassery**

**Subodh is going to Kozhikode which is 24 kilometres (km) away. Manjani is going to Thalassery which is 46 km away in the opposite direction.**

**Question: 22**

**How far is Kozhikode from Thalassery? ________**

**Answer: **Kozhikode distance from Thalassery

= Kozhikode distance + Thalassery distance

= 24 km + 46 km

= 70 km

**Question: 23**

***How much does Momun walk every day to reach school? ________**

**Answer: **Total distance of school from Momun home = 400 m + 150 m + 350 m + 40 m

= 940 m

Therefore, Momun has to walk 940 m every day to reach school

*** Is it more than 1 km? ________**

**Answer: **Since, 940 m is less than 1000 m

Therefore, it is not more than 1 km

**Question: 24**

**Find out how far your friends live from school and fill the table. Write in metres or kilometres.**

**Answer: **Following are the list of distance of school from their home

Friends Name | Distance of home from school |

Sohail | 500 m |

Amit | 2 km 100 m |

Alok | 1 km 400 m |

Sanjeev | 1 km 100 m |

Rohit | 5 km 400 m |

Rahul | 2 km 400 m |

*** Who among you lives nearest to the school?**

**Answer: A person who lives nearest to the school is Sohail**

*** Who lives farthest from the school?**

**Answer: A person who lives farthest from the school is Rohit**

*** How many children live less than 1 km away from your school?**

**Answer: **Me and Sohail. That means total two children lives less than 1 km away from school

*** Is there anyone who lives more than 5 km away from the school?**

**Answer:** Yes, Rohit lives more than 5 km away from the school

*** How do they come to school?**

**Answer:** They come to the school by school bus.

**Guess and Find Out**

**Question: 25**

**How long is the thread in a reel?**

**Answer: **The length of thread can be measured depending on the thickness of reel.

It may be 60 metres, 90 metres, 100 metres or 400 metres or more

**Question: 26**

**How long is the string of a kite reel? Can it be more than a kilometre long?**

**Answer: **A kite reel can be more than a kilometre long. It may be 500 metres, 900 metres, 1000 metres long.

**Question: 27**

**If a handkerchief is made out of a single thread, how long would that thread be?**

**Answer: **The length of thread may be about 4000 metres, if a handkerchief is made** out **of a single thread.

**NCERT book Page No: 22**

**Try to find out:**

**Question: 28**

**Which is the highest building that you have seen? About how many rooms high was it?**

**Answer: **The highest building that I saw is Qutub Minar. It is about 25 rooms high

**Question: 29**

**How high can a kite go? Can it go higher than the Qutub Minar?**

**Answer: **Yes, a kite can go higher than the Qutub Minar. It may go about 100 metres high.

**Question: 30**

**How high can a plane fly? Can it fly higher than Mount Everest which is about 9 km high?**

**Answer: **A plane can fly more than 10000 metres high. Yes, it can fly higher than the Mount Everest which is about 9 km high.