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## Tamilnadu Samacheer Kalvi 6th Maths Solutions Term 1 Chapter 1 Numbers Ex 1.1

Question 1.

Fill in the blanks.

- The smallest 7 digit number is …….
- The largest 8 digit number is ……..
- The place value of 5 in 7005380 is ………
- The expanded form of the number 76,70,905 is ……..

Solution:

- 1000000
- 99999999
- Five thousand
- 7000000 + 600000 + 70000 + 900 + 5

Question 2.

Say True or False.

- In the Indian System of Numeration, the number 67999037 is written as 67999037
- The successor of a one-digit number is always a one-digit number.
- The predecessor of a 3-digit number is always a 3 or 4-digit number.
- 88888 = 8 × 10000 + 8 × 100 + 8 × 10 + 8 × 1

Solution:

- True
- False
- False
- False

Question 3.

Complete the given order.

Ten crore, crore, ten lakh, ____, ____, _____ , _____, _____.

Solution:

One Lakh, Ten Thousand, One Thousand, Hundred, ten, One.

Question 4.

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

Solution:

Smallest six-digit number is 1,00,000

1 lakh = Ten Thousand

Another Method:

Lakh is only one place to the left of Ten thousand

1 lakh is 10 times ten thousand

1 lakh = Ten-Ten Thousand

Question 5.

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

Solution:

We know that the place value increases from right to left.

[∴ Arranging the digits in ascending order from right to left we get the largest number]

The largest number is 75320

The smallest number is 20357

[∵ Reverse order of 75320 is 02357. It becomes four-digit number 2357]

Question 6.

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

- 56,74,56,345
- 567,456,345

Solution:

- 56,74,56,345

Place value of 7 is 7 × 10,00,000 = 70,00,000 = Seventy Lakhs. - 567,456,345

Place value of 7 is 7 × 1,000,000 = 7,000,000 = Seven Million.

Question 7.

Write the following numbers in the International system by using commas.

(i) 347056

(ii) 7345671

(iii) 634567105

(iv) 1234567890

Solution:

Question 8.

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

Solution:

The largest six-digit number is 999999

Question 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 Lakhs Thirty-Two Thousand One Hundred and Five

(ii) 9,75,63,453

Nine crores Seventy Five Lakhs Sixty Three Thousand Four Hundred and Fifty-Three.

Question 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 and Forty-Five Thousand Six Hundred and Seventy-Eight

(ii) 8,343,710

Eight Million Three Hundred and 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.

Question 11.

Write the number name in numerals.

- Two crores thirty lakh fifty-one thousand nine hundred eighty.
- Sixty-six million three hundred forty-five thousand twenty-seven.
- Seven hundred eighty-nine million, two hundred thirteen thousand four hundred fifty-six.

Solution:

- 2,30,51,980
- 66,345,027
- 789,213,456

Question 12.

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

Solution:

26,345 sq km.

Question 13.

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

Solution:

1.000,000 (one million)

**Objective Type Questions**

Question 14.

1 billion is equal to

(a) 100 crore

(b) 100 million

(c) 100 lakh

(d) 10000 lakh

Solution:

(a) 100 crore

Question 15.

The successor of 10 million is

(a) 1000001

(b) 10000001

(c) 9999999

(d) 100001

Solution:

(b) 10000001

Question 16.

The difference between the successor and the predecessor of 99999 is

(a) 90000

(b) 1

(c) 2

(d) 99001

Solution:

(c) 2

Question 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

Solution:

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