Question (a) - Page 51 (Figure it out) - Prime Factorisation - Chapter 3 Class 7 - Finding Common Ground (Ganita Prakash II)

Transcript

Question (a) - Page 51 (Figure it out) List all the factors of the following numbers: (a) 90Let’s do Prime Factorisation of 90 So, we can write 90 = 2 × 3 × 3 × 5 Now, Factors would be Prime Factors Combination of prime factors And, number 1 Let’s look at each one of them Prime Factors: Prime Factors are 2, 3, 5 Combination of two prime factors: Factors are 2 × 3 = 6 3 × 3 = 9 3 × 5 = 15 2 × 5 = 10 Combination of three prime factors: Factors are 2 × 3 × 3 = 18 2 × 3 × 5 = 30 3 × 3 × 5 = 45 Combination of four prime factors: Factors are 2 × 3 × 3 × 5 = 90 Thus, Factors of 90 are 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90