Q11Written answer
Question: 11
Does the sum grow by 5 each time?
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Worked solution
Answer: Yes, the sum grows by 5 each time.
NCERT Book Page No: 115
NCERT · Class 4 · Maths
Chapter 10: Play with Patterns
Practice each question, then open the answer or worked solution.
Questions
20 questionsQ12Written answer
Question: 12
Complete this list of letters and numbers to help you.
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Q13Written answer
Question: 13
Teenu wants to write to his friend ‘Good Morning’.
What will he write by using the same rule?
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Worked solution
G = 7 O = 15 O = 15 D = 4
M = 13 O = 15 R = 18 N = 14 I = 9 N = 14 G = 7
Hence, Good Morning can be written as follows
Q14Written answer
Question: 14
If we change the rule and write 1 in place of ‘B’, 3 in place of ‘D’ and so on, then how will we write ‘let us dance’?
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Worked solution
Answer: L = 11 E = 4 T = 19
U = 20 S = 18
D = 3 A = 26 N = 13 C = 2 E = 4
Therefore, ‘let us dance’ can be written as follows
NCERT Book Page No: 116
Q15Written answer
Question: 15
What was Kahuli’s secret message?
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Answer: The new arrangement of letters for the secret message is given below:
| A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
| B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | A |
Hence, Kahuli’s secret message was ‘XF BSF GSJFOET’, i.e. WE ARE FRIENDS
Q16Written answer
Question: 16
What did Shablu and Jaggu write?
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Answer: The secret message written by Shablu is ‘IFMMP! IPX BSF ZPV?’ And ‘XJMM ZPV QMBZ XJUI NF?’
Hence,
‘IFMMP! IPX BSF ZPV?’ becomes – Hello! How are you?
And ‘XJMM ZPV QMBZ XJUI NF?’ becomes – Will you play with me?
The secret message written by Jaggu is ‘GJOF, UIBOL ZPV ZFT!’
Hence, the secret message written by Jaggu is – Fine, thank you. Yes!
Q17Written answer
Question: 17
Use the same rule to write – ‘Meet me on the moon’.
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Answer: ‘Meet me on the moon’ secret message will be NFFU NF PO UIF NPPO.
Q18Written answer
Question: 18
Make different rules and ask your friends to crack the secret message.
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Answer: Let the new rule be – write ‘A’ in the place of ‘C’, ‘B’ in the place of ‘D’ and so on. The new key for this new rule will be as follows:
| A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
| Y | Z | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X |
Now, write ‘I am Sorry’ by using this new rule.
The secret message for ‘I am Sorry’ will be ‘G YK QMPPW
NCERT Book Page No: 117-119
Q19Written answer
Question: 19
Now, Anisha is playing with this card. Draw what it will look like when upside down.
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Answer: The card, when made upside down, will look like as shown below:
Floor Patterns
Q20Written answer
Question: 20
Have you ever seen a floor with tiles of these shapes?
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Worked solution
Answer: No, I have never seen these shapes of tiles on the floor.
(a) Now, you cover this floor with this tile.
Answer: Do it yourself.
(b) Can you make such a floor design with a tile like a circle?
Try with this green tile without leaving a gap. Could you do it? Discuss with your friends.
Answer: Do it yourself.
We cannot make a design without leaving a gap by using circular tiles.
(c) Complete this tiling pattern.
Answer: Do it yourself.
(d) Ramaiya has made a wall with his blocks. Can you complete this for him?
Answer: Do it yourself.
(e) Renu began to paint this wall. Now you help her to complete it.
Answer: Do it yourself.