Question 1 - Page 51 - Prime Factorisation - Chapter 3 Class 7 - Finding Common Ground (Ganita Prakash II)

Transcript

Question 1 - Page 51 Similarly, is 2 × 7 = 14 a factor of 840? Why or why not? Is 2 × 2 × 2 a factor of 840? Why or why not? Is 3 × 3 × 3 a factor of 840? Why or why not? Now, 840 = 2 × 2 × 2 × 3 × 5 × 7 Let’s answer the questions one-by-one Is 2 × 7 = 14 a factor of 840? Since we have 2 × 7 in our prime factorization Yes, 2 × 7 (= 14) is a factor of 840 Is 2 × 2 × 2 a factor of 840? Since we have 2 × 2 × 2 in our prime factorization Yes, 2 × 2 × 2 (= 8) is a factor of 840 Is 3 × 3 × 3 a factor of 840? We do not have 3 × 3 × 3 in our prime factorization, we have only one 3 No, 3 × 3 × 3 is not a factor of 840