June 2020

Class 9 – Mathematics Coordinate Geometry – Exercise 3.2 Exercise 3.2 Question : Answer the following questions: (i) Name the horizontal and the vertical lines drawn to determine the position of any point in the Cartesian plane? (ii) Name each…

Class 9 – Mathematics Coordinate Geometry – Exercise 3.1 Exercise 3.1 Question :1. How will you describe the position of a mobile phone kept on the study table to another person? Answer : For describing the position of a mobile…

Class 9 – Mathematics Polynomials – Exercise 2.3 Exercise 2.3 Question : Find the remainder when x3 + 3×2 + 3x + 1 is divided by (i) x + 1           (ii) x – 1/2              (iii) x                (iv) x + π                 …

Class 9 – Mathematics Polynomials – Exercise 2.2 Exercise 2.2 Question : Find the value of the polynomial 5x – 4×2 + 3 at (i) x = 0                             (ii) x = -1                         (iii) x = 2 Answer : Let p(x)…

Class 9 – Mathematics Polynomials – Exercise 2.1 Exercise 2.1 Question : Which of the following expressions are polynomials in one variable and which are not? State reasons for your answer. (i) 4×2 – 3x + 7      (ii) y2 +…

Class 9 – Mathematics Number System – Exercise 1.6 Exercise 1.6 Question : 1:Find:             (i) 641/2                           (ii) 321/5                            (iii) 1251/3                Answer : (i) 641/2 = (82)1/2 = 82 * 1/2 = 81 = 8 (ii) 321/5 = (25)1/5 = 25…

Class 9 – Mathematics Number System – Exercise 1.5 Question : 1:Classify the following numbers as rational or irrational: (i) 2 – √5                (ii) (3 + √23) – √23            (iii) 2√7/7√7              (iv) 1/√2               (v) 2π Answer : (i) 2 –…

Class 9 – Mathematics Number System – Exercise 1.4 Exercise 1.4 Question : 1:Visualize 3.765 on the number line, using successive magnification. Answer : First of all, we observe that 3.765 lies between 3 and 4. Divide this portion in…

Class 9 – Mathematics Number System – Exercise 1.3 Exercise 1.3 Question : 1:Write the following in decimal form and say what kind of decimal expansion each has: (i) 36/100       (ii) 1/11       (iii) 4            (iv) 3/13          (v) 2/11             (vi) 329/400…

Class 9 – Mathematics Number System – Exercise 1.2 Exercise 1.2 Question : 1:State whether the following statements are true or false. Justify your answers. (i) Every irrational number is a real number. (ii) Every point on the number line…

Class 9 – Mathematics Number System – Exercise 1.1 Exercise 1.1 Question : 1:Is zero a rational number? Can you write it in the form p/q where p and q are integers and       q ≠ 0? Answer : Yes, zero…