RS Aggarwal Solutions Class 6 Chapter 3 Whole Numbers Exercise 3A

    

EXERCISE-3A

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Question 1

Q.1. Write the next three whole numbers after 30999.

Ans. After 30999, three whole numbers will be

$\begin{aligned}

& 30999+1=31000 \\

& 31000+1=31001 \\

& 31001+1=31002

\end{aligned}$

i.e., 31000,31001 and 31002

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Question 2

Q.2. Write the three whole numbers occurring just before 10001.

Ans. Before 10001, three whole numbers will
$\begin{aligned}
& \text { be } 10001-1=10000 \\
& 10000-1=9999 \\
& 9999-1=9998 \\
& \text { i.e., } 10000,9999,9998
\end{aligned}$

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Question 3

Q.3. How many whole numbers are there between 1032 and 1209 ?

Ans. Between 1032 and 1209, whole number are $1209-1031=178$

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Question 4

Q.4. Which is the smallest whole number?

Ans. The smallest whole number is 0

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Question 5

Q.5. Write the successor of :
(i) 2540801
(ii) 9999
(iii) 50904
(iv) 61639
(v) 687890
(vi) 5386700
(vii) 6475999
(viii) 9999999

Ans. The successor of
(i) 2540801 is $2540801+1=2540802$
(ii) 9999 is $9999+1=10000$
(iii) 50904 is $50904+1=50905$
(iv) 61639 is $61639+1=61640$
(v) 687890 is $687890+1=687891$
(vi) 5386700 is $5386700+1=5386701$
(vii) 6475999 is $6475999+1=6476000$

(viii) 9999999 is $9999999+1=10000000$

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Question 6

Q.6. Write the predecessor of :
(i) 97
(ii) 10000
(iii) 36900
(iv) 7684320
(v) 1566391
(vi) 2456800
(vii) 100000
(viii) 1000000

Ans.
Predecessor of
(i) 97 is $97-1=96$
(ii) 10000 is $10000-1=9999$
(iii) 36900 is $36900-1=36899$
(iv) 7684320 is $7684320-1=7684319$
(v) 1566391 is $1566391-1=1566390$
(vi) 2456800 is $2456800-1=2456799$
(vii) 100000 is $100000-1=99999$
(viii) 1000000 is $1000000-1=999999$

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Question 7

Q.7. Write down the three consecutive whole numbers just preceding 7510001.

Ans. Three consecutive whole numbers just preceding 7510001 are
(7510001 - 1), (7510001 - 2),
(7510001 - 3)
i.e. $7510000,7509999,7509998$.

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Question 8

Q.8. Write (T) for true and (F) for false against each of the following statements :
(i) Zero is the smallest natural number.
(ii) Zero is the smallest whole number.
(iii) Every whole number is a natural number.
(iv) Every natural number is a whole number.
(v) 1 is the smallest whole number.
(vi) The natural number 1 has no predecessor.
(vii) The whole number 1 has no predecessor.
(viii) The whole number 0 has no predecessor.
(ix) The predecessor of a two-digit number is never a single-digit number.
$(x)$ The successor of a two-digit number is always a two-digit number.
(xi) 500 is the predecessor of 499.
(xii) 7000 is the successor of 6999.

Ans.

(i) Zero is not a natural number. (F)

(ii) Zero is the smallest whole number ( T )

(iii) No, it is false, as zero is not a natural number but it is a whole number.

(iv) Yes, it is true, as set of natural numbers is a subset of whole numbers.

(v) False, zero is the smallest whole number.

(vi) The natural number 1 has no predecessor as 0 is the predecessor of 1 (T) Which is not a natural number

(vii) The whole number 1 has no predecessor ( F )

$\because$ Predecessor of 1 is 0 which is a whole number

(viii) The whole number 0 has no predecessor ( T )

(ix) The predecessor of a two-digit number is never a single-digit number (F) As predecessor of two digit number say 99 is $99-1=98$

Which is also a two-digit number and of 10 is $10-1=9$ which is single-digit number

(x) The successor of a two-digit number is always a two-digit number ( F )

$\because$ The successor of a two-digit number 99 is $99+1=100$ which is a three digit

number

(xi) 500 is the predecessor of 499 (F) As predecessor of 499 is $499-1=498$

not 500 as 500 is the successor of 499

(xii) 7000 is the successor of $6999(\mathrm{~T})$