Exercise - R-1 1. Find the value of 12 upto two decimal places using square root, 2. Write two irrational numbers whose sum and product are rational. 3. Write all integers between -5 and 5 with the help of number line. 4. In the property of indices am + a" = am", taking m = n, show that a = 1 5. In the property of indices a = am ", taking m = 0, show that 1 a" 6. Find LCM and HCF of the following pairs of numbers using prime factorisation method. (i) 321, 396, (ii) 455, 42 (iii) 408, 170 2 1 7. Write two rational numbers between and 1 11 6 8. Simplify V10x V5 and find its approximate value taking V2 = 1.41. P 9 from 9. Express in (iii) 2.47 (ii) 0.18 (i) 0.gi (iv) 2.4431 (11) (2/3 + 5)(2/3 - 15) 10. Simplify: ( 13 - v2)' (iii) (8 + 13)< (2 + 13) (1) J 14 3 (iv) 1+2 7+√3 (vi) 7-13