Exercise 1.1

Exercise 1.1

1. Fill in the blanks.

(i) The smallest 7 digit number is 10,00,000.

(ii) The largest 8 digit number is 9,99,99,999.

(iii) The place value of 5 in 7005380 is 5 × 1000 = 5000 (five thousand).

(iv) The expanded form of the number 76,70,905 is 7 × 1000000 + 6 × 100000 + 7 × 10000 + 0 × 1000 +9 × 100 + 0 × 10 + 5 × 1.

2. Say True or False.

(i) In the Indian System of Numeration the number 67999037 is written as 6,79,99,037. [True]

(ii) Successor of a one digit number is always a one digit number [False]

(ii) Predecessor of a 3-digit number is always a 3 or 4-digit number [False]

(iv) 88888 = 8 × 10000 + 8 × 100 + 8 × 10 + 8 × 1 [False]

3. Complete the given order.

Ten crore, crore, ten lakh, lakh, ten thousand, thousand, hundred, ten, one.

4. How many ten thousands are there in the smallest 6 digit number?

Solution:

Smallest 6 digit number is 1,00,000

No. of ten thousands =     100000

                                =          10000

= ‘10’ten thousands

5. Using the digits 5, 2, 0, 7, 3 form the largest 5 digit number and the smallest 5 digit number.

Solution:

Largest Number = 75320

Smallest Number = 20357

6. Observe the commas and write down the place value of 7.

(i) 56,74,56,345

(ii) 567,456,345

(i) 56,74,56,345 . ’

= 7 × 10,00,000

= 70,00,000

= 70 lakh

(ii) 567,456,345

= 7 × 1,000,000

= 7,000,000

= 7 million. ,

7. Write the following numbers in the International System by using commas.

(i) 347056

(ii) 7345671

(iii) 634567105

(iv) 1234567890

(i) 347056 = 347,056

(ii) 7345671 = 7,345,671

(iii) 634567105 = 634,567,105

(iv) 1234567890 = 1,234,567,890

8. Write the largest six digit number and put commas in the Indian and the International Systems.

Solution:

Largest 6 digit number = 999999

Indian System : 9,99,999 = Nine lakh ninety nine thousand nine hundred and ninety nine

International System : 999,999 = Nine hundred and ninety nine thousand nine hundred and ninety nine

9. Write the number names of the following numerals in the Indian System.

(i) 75,32,105

(ii) 9,75,63,453

Solution:

(i) 75,32,105 = Seventy five lakh thirty two thousand one hundred and five.

(ii) 9,75,63,453 = Nine crore seventy five lakh sixty three thousand four hundred and fifty three.

10. Write the number names in words using the International System.

(i) 345,678

(ii) 8,343,710

(iii) 103,456,789

Solution:

(i) 345,678 − Three hundred forty five thousand six hundred and seventy eight

(ii) 8,343,710 − Eight million three hundred forty three thousand seven hundred and ten

(iii) 103,456,789 − One hundred three million four hundred fifty six thousand seven hundred and eighty nine

11. Write the number name in numerals.

(i) Two crore thirty lakh fifty one thousand nine hundred eighty.

Answer: = 2,30,51,980

(ii) Sixty six million three hundred forty five thousand twenty seven.

Answer: = 66,345,027

(iii) Seven hundred eighty nine million, two hundred thirteen thousand four hundred fifty six.

Answer: = 789,213,456

12. Tamil Nadu has about twenty six thousand three hundred forty five square kilometre of Forest land. Write the number mentioned in the statement in the Indian System.

Solution: Forest land = 26,345 sq.km

13. The number of employees in the Indian Railways is about 10 lakh. Write this in the International System of numeration.

Solution:

Employees in Indian Railways = 10 lakh

In International System = ?

Indian System = TL L TTh Th H T O

                           1  0   0    0    0  0  0

International

System = M HTh TTh Th H T O

10,00,000 = 1 million

10 Lakh = 1 million 

Objective Type Questions

14. 1 billion is equal to

 (a) 100 crore

 (b) 100 million

 (c) 100 lakh

 (d) 10000 lakh

Answer: (a) 100 crore

15. The successor of 10 million is

 (a) 1000001

 (b) 10000001

 (c) 9999999

 (d) 100001

Answer: (a) 1000001

16. The difference between the successor and the predecessor of 99999 is

 (a) 90000

 (b) 1

 (c) 2

(d) 99001

Answer: (c) 2

17. The expanded form of the number 6,70,905 is

(a) 6 × 10000 + 7 × 1000 + 9 × 100 + 5 × 1

(b) 6 × 10000 + 7 × 1000 + 0 × 100 + 9 × 100 + 0 × 10 + 5 × 1

(c) 6 × 1000000 + 7 × 10000 + 0 × 1000 + 9 × 100 + 0 × 10 + 5 × 1

(d) 6 × 100000 + 7 × 10000 + 0 × 1000 + 9 × 100 + 0 × 10 + 5 × 1

Answer: (d) 6 × 100000 + 7 × 10000 + 0 × 1000 + 9 × 100 + 0 × 10 + 5 × 1

Answers:

Exercise 1.1

1) (i) 10,00,000 (ii) 9,99,99,999 (iii) Five Thousand (iv) 7000000+600000+70000+900+5

2) (i) True (ii) False(iii) False (iv) False

3) Lakh, Ten thousand, Thousand, Hundred, Ten, One

4) 10

5) Largest − 75320  Smallest − 20357

6) (i) 70,00,000 (ii) 7,000,000

7) (i) 347,056 (ii) 7,345,671 (iii) 634,567,105 (iv) 1,234,567,890

8) Indian System : 9,99,999 (Nine Lakh Ninety Nine Thousand Nine Hundred Ninety Nine)

International System : 999,999 (Nine Hundred Ninety Nine Thousand, Nine Hundred Nintey Nine)

9) (i) Seventy five lakh thirty two thousand one hundred five

    (ii) Nine crore seventy five lakh sixty three thousand four hundred fifty three

10) (i) Three hundred forty five thousand six hundred seventy eight

      (ii) Eight million three hundred forty three thousand seven hundred ten

      (iii) One hundred three million four hundred fifty six thousand seven hundred eighty nine

11) (i) 2,30,51,980 (ii) 66,345,027 (iii) 789,213,456

12) 26,345

13) 1,000,000 (One million)

Objective Type Questions

14) (a) 100 Crore

15) (b) 10000001

16) (c) 2

17) d) 6×100000 + 7×10000 + 0×1000 + 9×100 +0×10 + 5×1