Sunday, 12 January 2014

Square Root & Cube Root (by Group 1)

(Done by Group 1)

Math Workbook, Page 2.
Reference can be found in the math textbook on page 11.
Question 5  a), c), e) and g)


Find each of the following using prime factorisation.


a) square root of 2 025


          using prime factorisation, we get
3 x 3 x 3 x 3 x 5 x 5 =2025
(3x3x5) x (3x3x5) =2025
45 x 45 =2025

Ans: 45


c) square root of 3 969


3969=3x3x3x3x7x7
=(3x3x7)x(3x3x7)
=63 x 63

Answer: 63


e) cube root of 5 832


using prime factorisation, we get
2 x 2 x 2 x 3 x 3 x 3 x 3 x 3 x 3 =5832
(2x3x3) x (2x3x3) x (2x3x3) =5832
18 x 18 x 18 =5832

Ans: 18

g) cube root of 17 576

       using prime factorisation, we get
       2 x 2 x 2 x 13 x 13 x 13 =17576
      (2x13) x (2x13) x (2x13) =17576
       26 x 26 x 26 =17576


       Ans: 26

1 comment:

  1. Clear and systematic working.
    Good.

    3 points for part.
    Total = 12 points

    ReplyDelete