# NCERT Solutions Class 5 Mathematics Chapter 7 Can you see the pattern

## Chapter 7 Can you see the pattern Class 5 Mathematics NCERT Solutions

Class 5 Mathematics students should refer to the following NCERT questions with answers for Chapter 7 Can you see the pattern in Class 5. These NCERT Solutions with answers for Class 5 Mathematics will come in exams and help you to score good marks

### Chapter 7 Can you see the pattern NCERT Solutions Class 5 Mathematics

3. Magic Squares
____Do you remember magic triangles? Cone now, let’s make some magic squares.
Q. Fill this square using all the numbers from 46 to 54.
Ans.
In this magic square, the sum of each of the row of numbers (across down and diagonally) is always the same. We have to complete the magic squares, remembering that the numbers in each line are equal to 150.
Clearly:
In 3 rd row: The required number = 150 - 52 - 47 = 150 - 99 = 51
In 3 rd column: The required number = 150 - 49 - 47 = 150 - 96 = 54
In 2 nd row: The required number = 150 - 46 - 54 = 150 - 100 = 50
In 2 nd column: The required number = 150 - 50 - 52 = 150 - 102 = 188
In 1 st row: The required number = 150 - 18 - 49 = 150 - 97 = 53
Therefore, the complete magic square is

Q. Fill this square suing all the numbers from 21 to 29.
Rule: The total of each side is 75.
Ans.
Let us fix 26 on the top most left hand side box.
Taking the diagonal of the square, we have
26 + 25 = 51 and 75 - 51 = 24
Therefore, put 24 at the end of this diagonal.
Fix 22 on the top most - right side box.
Taking the diagonal in which 22 lies, we have
22 + 25 = 47 and 75 - 47 = 28
Therefore, put 28 at the end of this diagonal.
Clearly,
In 1 st row: The required number = 75 - (26 + 22) = 75 - 48 = 27
In 1 st column: The required number = 75 - (26 + 28) = 75 - 54 = 21
In 2 nd row: The required number = 75 - (21 + 25) = 75 - 46 = 29
In 2 nd column: The required number = 75 - (28 + 24) = 75 - 52 = 27
Therefore, the complete magic square is as shown below:

3. Fill in the blank spaces in the same way.
(a) 14 +…..+……= 34 + 24 + 20
(b) ……+ 42 + ……= 65 +…. + 80
(c) 200 + 300 + ….. = ….. + 400 + …….
(d) ….. + ….. + ….. = ….. + ….. + …….
Ans.

(a) 14 + 20 + 34 = 34 + 14 +20
(b) 80 + 42 + 65 = 65 + 42 + 80
(c) 200 + 300 + 400 = 300 + 400 + 200
(d) 34 + 29 +47 = 47 + 34 +29

4. Now you try and change these numbers into special numbers:
(a) 28 (b) 132 (c) 273
Ans. (a)

5. Choose any 3 x 3 box from a calendar and find the total in the same way.
Play this game with your family.
Ans.
Let us mark a 3 3 box (9 dates) on the calendar and see some magic.

Take the smallest number: 2
10
Multiply it by 9 x 9
Total 90

6. Take any number. Now multiply it by 2, 3, …… at every step. Also add 3 to it at each step. Look at the difference in the answer. Is it the same at every step?
12 2 + 3 = 27
12 3 + 3 = 39
12 4 + 3 = 51
12 5 + 3 = 63

Ans. Filling in the blank boxes, we have
12 6 + 3 = 75
12 7 + 3 = 87
12 8 + 3 = 99
12 9 + 3 = 111

7. Look at the numbers below. Look for the pattern. Can you take it forward?
(9 – 1) ÷ 8 = 1
(98 – 2) ÷ 8 = 12
(987 – 3) ÷ 8 = 123
(9876 – 4) ÷ 8 = ____
(98765 – 5) ÷ 8 = ____
( ____–__ ) ÷ 8 = ____
( ____–__ ) ÷ 8 = ____
Ans.
Yes, the given pattern can be taken forward as under:
(9 – 1) ÷ 8 = 1
(98 – 2) ÷ 8 = 12
(987 – 3) ÷ 8 = 123
(9876 – 4) ÷ 8 = 1234
(98765 – 5) ÷ 8 = 12345
(987654 – 6) ÷ 8 = 123456
(9876543 – 7) ÷8 = 1234567

1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 = 55
11 + 12 + .. + .. + .. + .. + .. + .. + .. + 20 = 155
21 + .. + .. + .. + .. + .. + .. + .. + .. + 30 = …
31 + .. + .. + .. + .. + .. + .. + .. + .. + 40 = …
41 + .. + .. + .. + .. + .. + .. + .. + .. + 50 = …
51 + .. + .. + .. + .. + .. + .. + .. + .. + 60 = 555
61 + .. + .. + .. + .. + .. + .. + .. + .. + 70 = …
Ans. 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 = 55
11 + 12 + 13 + 14 + 15 + 16 + 17 + 18 + 19 + 20 = 155
21 + 22 + 23 + 24 + 25 + 26 + 27 + 28 + 29 + 30 = 255
31 + 32 + 33 + 34 + 35 + 36 + 37 + 38 + 39 + 40 = 355
41 + 42 + 43 + 44 + 45 + 46 + 47 + 48 + 49 + 50 = 455
51 + 52 + 53 + 54 + 55 + 56 + 57 + 58 + 59 + 60 = 555
61 + 62 + 63 + 64 + 65 + 66 + 67 + 68 + 69 + 70 = 655

9. Take the first two odd numbers, now add the, see what you get.
Now, at every step, add the next odd number.
1 + 3 = 4 = 2 x 2
1 + 3 + 5 = 9 = 3 x 3
1 + 3 + 5 + 7 = 16 = 4 x 4

How far can you go on?
Ans. Let us complete it.
1 + 3 + 5 + 7 +9 = 25 = 5 5
1 + 3 + 5 + 7 + 9 + 11 = 36 = 6 6
1 + 3 + 5 + 7 + 9 + 11 + 13 = 49 = 7 7

10. Secret Numbers
Banno and binod were playing a guessing game by writing clues about a secret number. Each tried by writing clues about a secret number. Each tried to guess the other’s secret number from the clues. Can you guess their secret numbers?

(a) It is larger than half of 100.
Ans. (a) It is larger than half of 100 means > 50.

(b) It is more than 6 tens and less than 7 tens.
Ans. (b) It is more than 6 tens and less than 7 tens it lies between 60 and 70.

(c) The tens digit is one more than he one’s digit.
Ans. (c) The tens digit is one more than one’s digit is 6-5 =5.

(d) Together the digits have a sum of 11.
Ans. (d) Together the digits have the sum of 11, so the number is 65.

11. Write a set of clues for a secret number of your own. Then give it to a friend to guess your secret answer.
Ans. A set of clues to find secret numbers are:
____ It is larger than half of 100.
It is more than 7 tens and less than 8 tens.
The tens digit is one less than the one’s digit.
Together the digits have a sum of 15.

12. (a) Ask your friend-Write down his age. Add 5 to it. Multiply the sum by 2.
Subtract 10 from it. Next divide it by 2. What do you get?
Ans. (a) Age: 7
Add 5 to it: 7 + 5 = 12
Multiply the sum by 2 = 12 x 2 = 24
Subtract 10 from it = 24 - 10 = 14
Divide it by 2 =14/2 = 7

Ans.
(b) Take a number as 5(say)
Double it 5 x 2 = 10
Multiply by 5 = 10 x 5 = 50
Thus, we got the supposed answer.

(c) Look at this pattern of number and take it forward.
1 = 1 x 1
121 = 11 x 11
12321 = 111 x 111
1234321 = ?
Ans.
(c) Taking the pattern forward, we have
1234321 = 1111 x 1111.

 NCERT Solutions Class 5 Mathematics Chapter 1 The Fish Tale
 NCERT Solutions Class 5 Mathematics Chapter 2 Shapes and Angles
 NCERT Solutions Class 5 Mathematics Chapter 3 How Many Squares
 NCERT Solutions Class 5 Mathematics Chapter 4 Parts and Wholes
 NCERT Solutions Class 5 Mathematics Chapter 5 Does it look the same
 NCERT Solutions Class 5 Mathematics Chapter 6 Be my multiply
 NCERT Solutions Class 5 Mathematics Chapter 7 Can you see the pattern
 NCERT Solutions Class 5 Mathematics Chapter 8 Mapping Your Way
 NCERT Solutions Class 5 Mathematics Chapter 9 Boxes And Sketches
 NCERT Solutions Class 5 Mathematics Chapter 10 Tenths And Hundredths
 NCERT Solutions Class 5 Mathematics Chapter 11 Area and its Boundary
 NCERT Solutions Class 5 Mathematics Chapter 12 Smart Charts
 NCERT Solutions Class 5 Mathematics Chapter 13 Ways of Multiply and Divide
 NCERT Solutions Class 5 Mathematics Chapter 14 How Big How Heavy

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### NCERT Solutions Class 5 Mathematics Chapter 7 Can you see the pattern

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#### Class 5 NCERT Solution Mathematics Chapter 7 Can you see the pattern

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