Q.1. Write the next three whole numbers after 30999.
Ans. After 30999, three whole numbers will be
30999 + 1 = 31000
31000 + 1 = 31001
31001 + 1 = 31002
i.e., 31000, 31001 and 31002
Q.2. Write the three whole numbers occurring just before 10001.
Ans. Before 10001, three whole numbers will
be 10001 – 1 = 10000
10000 – 1 = 9999
9999 – 1 = 9998
i.e., 10000, 9999, 9998
Q.3. How many whole numbers are there between 1032 and 1209 ?
Ans. Between 1032 and 1209, whole number
are 1209 – 1031 = 178
Q.4. Which is the smallest whole number ?
Ans. The smallest whole number is 0
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
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
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.
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 twodigit number is never a singledigit number.
(x) The successor of a twodigit number is always a twodigit 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)
∵ Predecessor of 1 is 0 which is a whole number
(viii) The whole number 0 has no predecessor (T)
(ix) The predecessor of a twodigit number is never a singledigit number (F) As predecessor of two digit number say 99 is 99 – 1 = 98
Which is also a twodigit number and of 10 is 10 – 1 = 9 which is singledigit number
(x) The successor of a twodigit number is always a twodigit number (F)
∵ The successor of a twodigit 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 (T)
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