     Rational Numbers --------------------------------------------------- Linear Equations in One        Variable --------------------------------------------------- Understanding Quadrilaterals --------------------------------------------------- Practical Geometry --------------------------------------------------- Data Handling --------------------------------------------------- Squares and Square Roots --------------------------------------------------- Cubes and Cube Roots --------------------------------------------------- Comparing Quantities --------------------------------------------------- Algebraic Expressions and       Identities --------------------------------------------------- Visualising Solid Shapes --------------------------------------------------- Mensuration --------------------------------------------------- Exponents and Powers --------------------------------------------------- Direct and Inverse Proportions --------------------------------------------------- Factorisation --------------------------------------------------- Introduction to Graphs --------------------------------------------------- Playing with Numbers --------------------------------------------------- Ex-1.1   |   Ex-1.2 1. Using appropriate properties find  2. Write the additive inverse of following:     3. Verify that �(-x) = x for  4. Find the multiplicative inverse of the following:     (vi) -1 Answer: 1 5. Name the property under multiplication used in each of the following: Answer: Here, 1 is the multiplicative identity. Answer: Here commutativity of multiplication is shown. Answer: Here, multiplicative inverse is used.  Answer: Here, associativity is being used. Hence, this is not a case of multiplicative inverse. Hence, this is a case of multiplicative inverse. 10. Write. (i) The rational number that does not have a reciprocal. Answer: 0 does not have a reciprocal. Because a number divided by 0 is undefined. (ii) The rational numbers that are equal to their reciprocals. Answer: 1 and -1 are equal to their reciprocals. (iii) The rational number that is equal to its negative. Answer: 0 is the number equal to its negative. 11:Fill in the blanks. (i) Zero has __________ reciprocal. (ii) The numbers __________ and __________ are their own reciprocals (iii) The reciprocal of − 5 is __________. (iv) Reciprocal of 1/x, where x not equal to zero is __________. (v) The product of two rational numbers is always a __________. (vi) The reciprocal of a positive rational number is __________. Answer: (i) No (ii)1,-1 (iii)-1/5 (iv) x (v) Rational Number (vi) Positive rational number