Exercise 16.1 : Solutions of Questions on Page Number : 255 Q1 : Find the values of the letters in the following and give reasons for the steps involved. Answer : The addition of A and 5 is giving 2 i.e., a number whose ones digit is 2. This is possible only when digit A is … Read more
Exercise 15.1 : Solutions of Questions on Page Number : 236 Q1 : The following graph shows the temperature of a patient in a hospital, recorded every hour. (a) What was the patient’s temperature at 1 p.m.? (b) When was the patient’s temperature 38.5°C? (c) The patient’s temperature was the same two times during the period … Read more
Exercise 14.1 : Solutions of Questions on Page Number : 220 Q1 : Find the common factors of the terms (i) 12x, 36 (ii) 2y, 22xy (iii) 14pq, 28p2q2 (iv) 2x, 3×2, 4 (v) 6abc, 24ab2, 12a2b (vi) 16×3, -4×2, 32x (vii) 10pq, 20qr, 30rp (viii) 3x2y3, 10x3y2, 6x2y2z Answer : (i) 12x = 2 x … Read more
Exercise 13.1 : Solutions of Questions on Page Number : 208 Q1 : Following are the car parking charges near a railway station up to 4 hours Rs 60 8 hours Rs 100 12 hours Rs 140 24 hours Rs 180 Check if the parking charges are in direct proportion to the parking time. Answer … Read more
Exercise 12.1 : Solutions of Questions on Page Number : 197 Q1 : Evaluate (i) 3 – 2 (ii) ( – 4) – 2 (iii) Answer : (i) (ii) (iii) Q2 :Simplify and express the result in power notation with positive exponent. (i) (ii) (iii) (iv) (v) Answer : (i) ( – 4)5 ÷( – 4)8 … Read more
Exercise 11.1 : Solutions of Questions on Page Number : 171 Q1 :A square and a rectangular field with measurements as given in the figure have the same perimeter. Which field has a larger area? Answer : Perimeter of square = 4 (Side of the square) = 4 (60 m) = 240 m Perimeter of … Read more
Exercise 10.1 : Solutions of Questions on Page Number : 157 Q1 : For each of the given solid, the two views are given. Match for each solid the corresponding top and front views. Answer : The given solids, matched to their respective side view and top view, are as follows. Object Side view Top … Read more
Exercise 9.1 : Solutions of Questions on Page Number : 140 Q1 : Identify the terms, their coefficients for each of the following expressions. (i) 5xyz2 – 3zy (ii) 1 + x + x2 (iii) 4x2y2 – 4x2y2z2 + z2 (iv) 3 – pq + qr – rp (v) (vi) 0.3a – 0.6ab + 0.5b … Read more
Exercise 8.1 : Solutions of Questions on Page Number : 119 Q1 : Find the ratio of the following: (a) Speed of a cycle 15 km per hour to the speed of scooter 30 km per hour. (b) 5 m to 10 km (c) 50 paise to Rs 5 Answer : (a) Ratio of the … Read more
Exercise 7.1 : Solutions of Questions on Page Number : 114 Q1 : Which of the following numbers are notperfect cubes? (i) 216 (ii) 128 (iii) 1000 (iv) 100 (v) 46656 Answer : (i) The prime factorisation of 216 is as follows. Q2 : Find the smallest number by which each of the following numbers must … Read more