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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:

- 10,00,000
- 9,99,99,999
- 5 × 1000 = 5000
- 7 × 10,00,000 + 6 × 1,00,000 + 7 × 10,000 + 0 + 9 × 100 + 0 + 5 × 1

(or)

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

Question 2.

Say True or False.

- In the Indian System of Numeration, the number 67999037 is written as 6,79,99,037
- The successor of a one-digit number is always a one-digit number 9 + 1 = 10
- The predecessor of a 3-digit number is always a 3 or 4 digit number 100 – 1 = 99
- 88888 = 8 × 10000 + 8 × 100 + 8 × 10 + 8 × 1

Solution:

- True
- False
- False
- False

Question 3.

Complete the given order.

Ten crores, crore, ten lakh, ………, ……….., ……….., ………, …….., ……..

Solution:

Ten crores, Crore, Ten lakh, Lakh, Ten Thousand, Thousand, Hundred, Ten, One

Question 4.

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

Solution:

Smallest 6 digit number = 1,00,000

= \(\frac{100000}{10000}\) = 10

1 Lakh = 10 Ten Thousands

Question 5.

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

Solution:

Given digits = 5, 2, 0, 7, 3

Largest 5 digit number – 75320

Smallest 5 digit number – 20357

Question 6.

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

(i) 56,74,56,345

(ii) 567,456,345

Solution:

(i) 70,00,000

(ii) 7,000,000

Question 7.

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

- 347056
- 7345671
- 634567105
- 1234567890

Solution:

- 347,056
- 7,345,671
- 634,567,105
- 1,234,567,890

Question 8.

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

Solution:

Largest 6 digit number = 9,99,999

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)

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) Seventy-five lakh thirty-two thousand one hundred five.

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

Question 10.

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

- 345,678
- 8,343,710
- 103,456,789

Solution:

- Three hundred forty-five thousand six hundred seventy-eight.
- Eight million three hundred forty-three thousand seven hundred ten.
- One hundred three million four hundred fifty-six thousand seven hundred eighty-nine.

Question 11.

Write the number name in numerals.

- Two crores thirty lakhs 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

Question 13.

The number of employees in the Indian Railways is about 10 lakh. 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 successor and 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