CBSE Class 7 Mathematics
Question 10 of 14
Large Numbers Around Us — Question 10
Back to all questions 10
Question You are given some number cards: 4000, 13000, 300, 70000, 150000, 20, and 5. Using the cards, get as close as you can to the numbers below using any operation you want. Each card can be used only once to make a particular number.
(a) 1,10,000: Closest I could make is 4000 × (20 + 5) + 13000 = 1,13,000
(b) 2,00,000:
(c) 5,80,000:
(d) 12,45,000:
(e) 20,90,800:
(a) 4000 × (20 + 5) + 13000 = 4000 × 25 + 13000 = 100000+ 13000 = 113000 This gives us 1,13,000, which is very close to 1,10,000. (b) 1,50,000 + 70,000 – 4000 × 5 = 2,00,000 (c) 70,000 × 5 + 1,50,000 + 4,000 × 20 = 5,80,000 (d) 70,000 × 20 – 1,50,000 – 4,000 – 300 × 5 = 12,44,500 This gives us 12,44,500, which is very close to 12,45,000. (e) 13,000 × 300 – 70,000(20 + 5) – 1,50,000 + 4,000 = 20,04,000