June 2020

Class 8 – Mathematics Algebraic Expressions and Identities – Exercise 11.4 Question :1.Given a cylindrical tank, in which situation will you find surface are and in which situation volume. (a) To find how much it can hold. (b) Number of…

Class 8 – Mathematics Algebraic Expressions and Identities – Exercise 11.3 Question :1. There are two cuboidal boxes as shown in the adjoining figure. Which box requires the lesser amount of material to make? Answer : (a) Given: Length of…

Class 8 – Mathematics Algebraic Expressions and Identities – Exercise 11.2 Question :1.The shape of the top surface of a table is a trapezium. Find its area if its parallel sides are 1 m and 1.2 m and perpendicular distance…

Class 8 – Mathematics Algebraic Expressions and Identities – Exercise 11.1 Question :1. A square and a rectangular field with measurements as given in the figure have the same perimeter. Which field has a larger area? Answer : Given: The…

Class 8 – Mathematics Visualising Solid Shapes – Exercise 10.2rm Question :1.Can a polyhedron have for its faces Answer : (i) 3 triangles? (ii) 4 triangles? (iii) a square and four triangles? A polyhedron is bounded by four or more…

Class 8 – Mathematics Visualising Solid Shapes – Exercise 10.1 Question :1.For each of the given solid, the two views are given. Match for each solid the corresponding top and front views. The first one is done for you. Answer…

Class 8 – Mathematics Algebraic Expressions and Identities – Exercise 9.5 Question :1. Use a suitable identity to get each of the following products: (i) (x + 3)(x + 3) (ii) (2y + 5)(2y + 5) (iii) (2a − 7)(2a…

Class 8 – Mathematics Algebraic Expressions and Identities – Exercise 9.4 Question :1. Multiply the binomials: (i) (2x + 5) and (4x – 3) (ii) (y – 8) and (3y – 4) (iii) (2.5𝓁 – 0.5m) and (2.5𝓁 + 0.5m)…

Class 8 – Mathematics Algebraic Expressions and Identities – Exercise 9.3 1. Carry out the multiplication of the expressions in each of the following pairs: (i) 4p, q + r (ii) ab, a – b (iii) a + b, 7a²b²…

Class 8 – Mathematics Algebraic Expressions and Identities – Exercise 9.2 Question :1. Find the product of the following pairs of monomials: (i) 4, 7p (ii) -4p, 7p (iii) -4p, 7pq (iv) 4p³, -3p (v) 4p, 0 Answer : (i)…

Class 8 – Mathematics Algebraic Expressions and Identities – Exercise 9.1 Question :1. Identify the terms, their coefficients for each of the following expressions: (i) 5xyz² – 3zy (ii) 1 + 𝓍 + 𝓍 ² (iii) 4𝓍²y² – 4𝓍²y²z² +…

Class 8 – Mathematics Comparing Quantities – Exercise 8.2 Question: 1. A man got 10% increase in his salary. If his new salary is Rs.1,54,000, find his original salary. Answer : Let original salary be Rs.100. Therefore New salary i.e.,…