Question

Class:8

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✅✅Answer the question no,1,2,3,4,5,6✅✅

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Answer 1

Answer:

1) 12

2) 1+3+5+7+9+11+13

3) sum of first n odd numbers =n^2= 9^2=81

4) 64/125

5) 20

6) no by observation the unit digit of cubes of numbers from 0 to 9 , 1 appears only in case of cubes of odd numbers

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Answer 2

Step-by-step explanation:

1. 144-1

143-3

140-5

135-7

128-9

119-11

108-13

95-15

80-17

63-19

44-21

23-23

As at 12 th step the answer is √144=12

2. As, √49 = 7

49 can be expressed as sum of 1st seven odd numbers

49 = 1+3+5+7+9+11+13

3. As they are first 9 odd numbers their sum will be 9^2=81

4. 8/25

5. 20

6. No, if we check the last digit of 132651 it is 1

Check if square of any single digit number's last digit is 1

1^2 =1

2^2=4

3^2=9

4^2=6

5^2=5

6^2=6

7^2=9

8^2=4

9^2=1

Square of any even number doesn't have 1 as it's last digit so, it is not square any even number.