Chapter 14 Symmetry Exercise 14.2
Chapter 14 Symmetry Exercise 14.2 Question 1. Which of the following figures have rotational symmetry of order more than 1? Solution: The figure (a), (b), (d), (e) and (f) have rotational symmetry more than 1. Question 2. Give the order of rotational symmetry for each figure: Solution:
Chapter 14 Symmetry Exercise 14.1
Chapter 14 Symmetry Exercise 14.1 Question 1. Copy the figures with punched holes and find the axis of symmetry for the following: Solution: The axis of symmetry is shown by following line. Question 2. Give the line(s) of symmetry, find the other hole(s): Solution: Question 3. In the following figures, the mirror line (i.e., the […]
Chapter 13 Exponents and Powers
Chapter 13 Exponents and Powers Very Short Answer Type Question 1. Express 343 as a power of 7. Solution: We have 343 = 7 × 7 × 7 = 73 Thus, 343 = 73 Question 2. Which is greater 32 or 23? Solution: We have 32 = 3 × 3 = 9 23 = 2 × 2 × […]
Chapter 13 Exponents and Powers Exercise 13.3
Chapter 13 Exponents and Powers Exercise 13.3 Ex 13.3 Class 7 Maths Question 1. Write the following numbers in the e×panded forms: 279404, 3006194, 2806196, 120719, 20068 Solution: (i) 279404 = 2 × 100000 + 7 × 10000 + 9 × 1000 + 4 × 100 + 0 × 10 + 4 = 2 × […]
Chapter 13 Exponents and Powers Exercise 13.2
Chapter 13 Exponents and Powers Exercise 13.2 Question 1. Using laws of exponents, simplify and write the answer in exponential form: Question 2. Simplify and express each of the following in exponential form: Solution: Question 3. Say true or false and justify your answer: (i) 10 × 1011 = 10011 (ii) 23 > 52 (iii) 23 × 32 = […]
Chapter 13 Exponents and Powers Exercise 13.1
Chapter 13 Exponents and Powers Exercise 13.1 Question 1. Find the value of (i) 26 (ii) 93 (iii) 112 (iv) 54 Solution: (i) 26 = 2 × 2 × 2 × 2 × 2 × 2 = 64 (ii) 93 = 9 × 9 × 9 = 729 (iii) 112 = 11 × 11 = 121 (iv) 54 = […]
Chapter 12 Algebraic Expressions
Chapter 12 Algebraic Expressions Very Short Answer Type Question 1. Identify in the given expressions, terms which are not constants. Give their numerical coefficients. (i) 5x – 3 (ii) 11 – 2y2 (iii) 2x – 1 (iv) 4x2y + 3xy2 – 5 Solution: Question 4. Classify the following into monomials, binomial and trinomials. (i) -6 (ii) […]
Chapter 12 Algebraic Expressions Exercise 12.4
Chapter 12 Algebraic Expressions Exercise 12.4 Question 2. Use the given algebraic expression to complete the table of number patterns: S.No. Expression Terms 1st 2nd 3rd 4th 5th … 10th … 100th … (i) 2n – 1 1 3 5 7 9 – 19 – – – (ii) 3n + 2 5 8 11 14 […]
Chapter 12 Algebraic Expressions Exercise 12.3
Chapter 12 Algebraic Expressions Exercise 12.3 Question 2. If p = -2, find the value of: (i) 4p + 7 (ii) -3p2 + 4p + 7 (iii) -2p3 – 3p2 + 4p + 7 Solution: (i) 4p + 7 Putting p = -2, we get 4(-2) + 7 = -8 + 7 = -1 (ii) -3p2 + 4p + […]
Chapter 12 Algebraic Expressions Exercise 12.2
Chapter 12 Algebraic Expressions Exercise 12.2 Question 1. Simplify combining like terms: (i) 21b -32 + 7b- 206 (ii) -z2 + 13z2 -5z + 7z3 – 152 (iii) p – (p – q) – q – (q – p) (iv) 3a – 2b — ab – (a – b + ab) + 3ab + 6 – a […]