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 × 105 +...

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...

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 = 5 × 5 × 5 × 5 = 625 Question 2....

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...

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 – – – – – – (iii)...
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