You are given two sets of number cards numbered from 1 - 9. Place a number card in each box below to get the: Class 7

You are given two sets of number cards numbered from 1 - 9. Place a number card in each box below to get the: Class 7

Question 1.

You are given two sets of number cards numbered from 1 - 9. Place a number card in each box below to get the Class 7

(a) largest possible sum

(b) smallest possible difference of the two resulting numbers.

Solution:

(a)

(b)

Question 2.

You are given some number cards; 4000, 13000, 300, 70000, 150000, 20, 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 for making a particular number. Class 7

(a) 1,10,000: Closest I could make is 4000 × (20 + 5) + 13000 = 1,13,000

Solution:

1,10,000 : Closest I could make is 4000 × (20 + 5) + 13000 = 1,13,000

(b) 2,00,000:

Solution:

2,00,000 = 150000 + 70000 - (13000 + 4000 + 300 + 20 + 5)

= 202675

(c) 5,80,000:

Solution:

5,80,000 = 70000 × 5 + 150000 + 4000 × 20 = 580000

(d) 12,45,000:

Solution:

12,45,000 = 13000 × 300 - 150000 × 20 + 70000 × 5

= 1250000

(e) 20,90,800:

Solution:

20,90,800 = 70000 × 20 + 150000 × 5

= 2150000

Question 3.

Find out how many coins should be stacked to match the height of the Statue of Unity. Assume each coin is 1 mm thick. Class 7

Solution:

(180 × 100 × 10) ÷ 1 = 180000 coins.