Question 3 - Figure it out - Page 22, 23 - Chapter 2 Class 8 - Power Play (Ganita Prakash)

Transcript

Question 3 Write the numerical value of each of the following: (i) 2 × 1032 × 103 = 2 × 10 × 10 × 10 = 2 × 1000 = 2000 Question 3 Write the numerical value of each of the following: (ii) 72 × 23 72 × 22 = 7 × 7 × 2 × 2 = 49 × 4 = 196 Question 3 Write the numerical value of each of the following: (iii) 3 × 443 × 44 = 3 × 4 × 4 × 4 × 4 = 12 × 16 × 4 = 16 × 12 × 4 = 192 × 4 = 768 Question 3 Write the numerical value of each of the following: (iv) (– 3)2 × (– 5)2(–3)2 × (–5)2 = −3 × −3 × −5 × −5 = 3 × 3 × 5 × 5 = 9 × 25 = 225 Question 3 Write the numerical value of each of the following: (v) 32 × 10432 × 104 = 3 × 3 × 10 × 10 × 10 × 10 = 9 × 10000 = 90000 = 90,000 Question 3 Write the numerical value of each of the following: (vi) (– 2)5 × (– 10)6From our Concepts section in the beginning of the chapter We know that (−1)odd number = −1 (−1)even number = 1 For (–2)5 Since 5 is an odd number, it will be negative (–2)5 = – 25 For (–10)6 Since 6 is an even number, it will be positive (–10)6 = 106 Question 3 Write the numerical value of each of the following: (vi) (– 2)5 × (– 10)6Now, our equation becomes (–2)5 × (–10)6 = –25 × 106 = 2 × 2 × 2 × 2 × 2 × 10 × 10 × 10 × 10 × 10 × 10 = 8 × 4 × 1000000 = 32 × 1000000 = 3,20,00,000