Slide9.JPG

Slide10.JPG
Slide11.JPG Slide12.JPG

  1. Chapter 6 Class 8 Squares and Square Roots
  2. Serial order wise

Transcript

Ex 6.3, 3 Find the square roots of 100 and 169 by the method of repeated subtraction. Square root of 100. 100 − 1 = 99 99 − 3 = 96 96 − 5 = 91 91 − 7 = 84 84 − 9 = 75 75 − 11 = 64 64 − 13 = 51 51 − 15 = 36 36 − 17 = 19 19 − 19 = 0 To find the square root, we subtract successive odd numbers from the number till we obtain 0. The total numbers you subtract is the square root of number. Since, after subtracting 10 numbers, we obtained 0. ∴ √𝟏𝟎𝟎 = 10. Square root of 169. 169 − 1 = 168 168 − 3 = 165 165 − 5 = 160 160 − 7 = 153 153 − 9 = 144 144 − 11 = 133 133 − 13 = 120 120 − 15 = 105 105 – 17 = 88 88 – 19 = 69 69 – 21 = 48 48 – 23 = 25 25 – 25 = 0 Since, after subtracting 13 numbers, we obtained 0. ∴ √𝟏𝟔𝟗 = 13. Since, after subtracting 10 numbers, we obtained 0. ∴ √𝟏𝟎𝟎 = 10. Square root of 169. 169 − 1 = 168 168 − 3 = 165 165 − 5 = 160 160 − 7 = 153 153 − 9 = 144 144 − 11 = 133 133 − 13 = 120 120 − 15 = 105 Since, after subtracting 13 numbers, we obtained 0. ∴ √𝟏𝟔𝟗 = 13. Since, after subtracting 10 numbers, we obtained 0. ∴ √𝟏𝟎𝟎 = 10. Square root of 169. 169 − 1 = 168 168 − 3 = 165 165 − 5 = 160 160 − 7 = 153 153 − 9 = 144 144 − 11 = 133 133 − 13 = 120 120 − 15 = 105 Since, after subtracting 13 numbers, we obtained 0. ∴ √𝟏𝟔𝟗 = 13. To find the square root, subtract successive odd numbers from the number till you obtain 0. The total numbers you subtract is the square root of number.

About the Author

Davneet Singh's photo - Teacher, Computer Engineer, Marketer
Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 8 years. He provides courses for Maths and Science at Teachoo. You can check his NCERT Solutions from Class 6 to 12.