6th Maths Guide Term 1 English Medium – Chapter 1 Numbers Ex 1.1 | Numbers

1. Fill in the blanks.

(i) The smallest 7 digit number is _______

Ans: 10,00,000

(ii) The largest 8 digit number is _______

Ans: 9,99,99,999

(iii) The place value of 5 in 7005380 is _______

Ans: 5 x 1000 (Five Thousand)

(iv) The expanded form of the number 76,70,905 is _______

Ans: 70,00,000 + 6,00,000 + 70,000 + 900 + 5

2. Say True or False.

(i) Successor of a one digit number is always a one digit number

Ans: False

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

Ans: False

(iii) In the Indian System of Numeration the number 67999037 is written as 6,79,99,037.

Ans: True

(iv) 88,888 = 8 × 10000 + 8 × 100 + 8 × 10 + 8 × 1

Ans: False

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

Smallest Six Digit Number is 1,00,00

1,00,000 / 10000 = 10

1 Lakh = 10 Ten Thousand

Ans: 10 Ten Thousand

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

(i) 56,74,56,345

Place Value of 7

7 x 10,00,000 = 70,00,000 (70 Lakhs)

Ans: 70,00,000 (70 Lakhs)

(ii) 567,456,345

Place Value of 7

7 x 1,000,000 = 7,000,000 (7 Million)

Ans: 7,000,000 (7 Million)

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

(i) 347056

Ans: 347,056

(ii) 7345671

Ans: 7,345,671

(iii) 634567105

Ans: 634,567,105

(iv) 1234567890

Ans: 123,4567,890

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

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 Ninety Nine)

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

(i) 75,32,105

Ans: Seventy Five Lakh Thirty Two Thousand one Hundred Five

(ii) 9,75,63,453

Ans: Nine Crore Seventy Five Lakh Sixty Three Thousand Four Hundred Fifty Three.

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

(i) 345,678

Ans: Three Hundred and Forty-Five Thousand Six Hundred and Seventy Eight

(ii) 8,343,710

Ans: Eight Million Three Hundred Forty Three Thousand Seven Hundred Ten

(iii) 103,456,789

Ans: One Hundred Three million Four Hundred Fifty Six Thousand Seven Hundred Eighty Nine.

9. Write the number name in numerals.

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

Ans: 2,30,51,980

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

Ans: 66,345,027

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

Ans: 789,213,456

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

Ans: 26,345 sq.km

11. The number of employees in the Indian Railways is about ten lakhs. Write this in the International System of numeration.

Ans: 1,000,000 (one million)

Objective Type Questions

12. The successor of 10 million is

1. 1000001
2. 10000001
3. 9999999
4. 100001

Ans: 10000001

Explanation

10000000 + 1 = 10000001

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

1. 90000
2. 1
3. 2
4. 99001

Ans: 2

Explanation

• 99999 இன் தொடரி 100000
• 99999 இன் முன்னனி 999998
• 100000 − 999998 = 2

14. 1 billion is equal to

1. 100 crore
2. 100 million
3. 100 lakh
4. 10,000 lakh

Ans: 100 crore

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

1. 6 × 10000 + 7 × 1000 + 9 × 100 + 5 × 1
2. 6 × 10000 + 7 × 1000 + 0 × 100 + 9 × 100 + 0 × 10 + 5 × 1
3. 6 × 1000000 + 7 × 10000 + 0 × 1000 + 9 × 100 + 0 × 10 + 5 × 1
4. 6 × 100000 + 7 × 10000 + 0 × 1000 + 9 × 100 + 0 × 10 + 5 × 1

Ans: 6 × 100000 + 7 × 10000 + 0 × 1000 + 9 × 100 + 0 × 10 + 5 × 1