**NCERT Solutions for Class 4 Mathematics Unit-1 Building With Bricks**

**NCERT Textbook Page 2**

**1. Which floor pattern do you like the most?**

**Ans**. I like pattern 5 because this seems familiar.

**2. Have you seen such patterns anywhere?**

**Ans.** Yes, this type of pattern is prevalent in mosques.

**NCERT Textbook Page 3**

**1. Which pattern is made in a circle?**

**Ans.** J-pattern is made in a circle.

**2. In which pattern can you show mirror halves? Draw a line.**

**Ans**. We can show mirror halves in pattern H.

**3. Now you draw some new floor patterns.**

**Ans**. Some new floor patterns made of brick are given here.

**NCERT Textbook Page 4**

**1. How to draw a brick?**

**Ans**. Drawing of brick is given below:

**2. How many faces in all does a brick have?**

**Ans.** A brick has six faces.

**3. Is any face of a brick a square?**

**Ans**. No. A brick has no square face.

**4. Draw the smallest face of the brick.**

**Ans.** Smallest face of a brick is being drawn here:

**5. Which of these are the faces of a brick? Mark a (Right)**

**Ans.**

**6. Which of these is a drawing of a brick? Mark a (Right)**

**Ans.**

**7. Make a drawing of this box to show 3 of its faces.**

**Ans**. Drawing of the given box with three faces is given below:

**8. Can you make a drawing of a brick which shows 4 of its faces?**

**Ans.** No. Such drawing cannot be made. ‘

**NCERT Textbook Page 5**

**1. What do you think? Which wall will be stronger?**

**Ans.** Wall made by Zainab will be stronger

**NCERT Textbook Page 6**

**1. How many different ‘jaali’ patterns can you see in these two photos?**

**Ans.** There are five different ‘jaali’ patterns in the given two photos.

**NCERT Textbook Page 7**

**1. Now colour some bricks red and make your own ‘jaali’ patterns in the wall drawn below.**

**Ans.** My new ‘jaali’ pattern is given in adjoining figure.

**2. Now draw some jharokha pattern on the wall here. You can shade it black.**

**Ans**. New jharokha pattern is given here:

**NCERT Textbook Page 9**

**1. Have you seen arches in a bridge?**

**Ans**. Yes.

**2. Where else have you seen an arch?**

**Ans**. I saw arches in old bridges. One of such bridges is situated in Jaunpur on the river Saryu

**3. Isn’t the ‘jaali’ of this window beautiful? It is made of thin bricks. Have you ever seen thin bricks? Look around.**

**Ans.** The ‘jaali’ of the window given in photograph is very beautiful. I have seen thin bricks. In Red Fort, situated in Delhi, thin bricks are used.

**NCERT Textbook Page 10**

**1. Which of these bricks have curved edges?**

**Ans.** Bricks given in the figure (iii) and (iv) from the top left have curved edges.

**2. How many faces do you see of the longest brick?**

**Ans**. Two faces are seen in the longest brick given in the figure.

**3. Is there any brick which has more than six faces?**

**Ans**. There are six faces in a brick, but only three of them can be seen at a time. A broken brick may have more than six faces.

**4. Have you seen bricks of different sizes?**

**Ans.** Yes, I saw bricks of different sizes.

**5. Take one brick and measure it.**

** (a) How long is it? (b) How wide is it? (c) How high is it?**

**Ans.** (a) 10 inches (b) 5 inches (c) 3 inches.

**6. Muniya wants to make a wall 1 metre long. How many bricks will she need to put in a line?**

**Ans.** She requires 4 bricks. The wall will become 25.4 x 4 = 1.016 metre long which is slightly more than one metre.

**7. Can you guess how high is the chimney here? Is! it:**

** (a) About 5 metres? (b) About 15 metres? (c) About 50 metres?**

**Ans.** The height of chimney given in the figure is about 50 metres.

**NCERT Textbook Page 11**

**1. Here are four pictures from the brick kiln. These pictures are jumbled up. Look at them carefully. Write the correct order**.

**Ans.** The correct order of the figure is C, D, B, A.

**NCERT Textbook Page 12**

**1. Can you try to write the number one lakh.**

**Ans.** 100000.

**2. Look at these photos and guess how many bricks are carried by this truck.**

**Ans**. Usually, a truck carries about 3000 bricks.

**3. Bhajan decided to buy the new bricks from Brickabad. He bought three thousand bricks. How much did he pay?**

** Given the price of bricks**

** Old bricks — Rs 1200 for one thousand bricks**

** New bricks from Intapur — Rs 1800 for one thousand bricks**

** New bricks from Brickabad — Rs 2000 for one thousand bricks**

**Ans**. Bhajan has to pay Rs 6000.

**1. Guess what he will pay if he buys 500 old bricks.**

**Ans.** He will pay Rs 600.