EXERCISE 2.1

1).
Write the next three natural numbers after 10999.
Ans. The next three natural numbers after 10999 are 11000, 11001 and 11002

2). Write the three whole numbers occurring just before 10001.
Ans. 10000, 9999 and 9998

3). Which is the smallest whole number?
Ans. 0

4). How many whole numbers are there between 32 and 53?
Ans.33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52. There are 20 numbers.

5). Write successor of
a)2440701          b)100199       c)1099999       d)2345670
Ans. a)2440702  b)100200      c)1100000      d)2345671

6). Write the predecessor of:
a) 94       b) 10000      c) 208090          d) 7654321
Ans. a) 93      b)9999           c)208089          d)7654320

7). In each of the following pairs of numbers, state which the whole number is on the left of the order number on the number line. Also write them with the appropriate signs (>,<) between them.
a)530 , 503          b)370 , 307           c)98765 , 56789      d)9830415 , 10023001
Ans. a) 530 > 503
503 is on the left side of 530 on the number line.
b) 370 > 307
307 is on the left side of 370 on the number line.
c) 98,765 > 56,789
56,789 is on the left side 0f 98,765 on the number line.
d) 98,30,415 < 1,00,23,001
98,30,415 is on the left side of 1,00,23,001 on the number line.

8). Which of the following statements are true(T) and which are false(F):
a)Zero is the smallest natural number.
Ans. False. 1 is the smallest natural number.
b)400 is the predecessor of 399
Ans. False. 398 is the predecessor of 399.
c)Zero is the smallest whole number.
Ans. True.
d)600 is the successor of 599
Ans. True.
e) All natural numbers are whole numbers.
Ans. True.
f) All whole numbers are natural numbers.
Ans. False. O is not a natural number.
g) The predecessor of a two digit number is never a single digit number.
Ans. False. Eg predecessor of 10 is 9.
h)1 is the smallest whole number.
Ans. False. 0 is the smallest whole number.
i) The natural number 1 has no predecessor.
Ans. True.
j) The whole number 1 has no predecessor.
Ans. False. 0 is the predecessor of 1 and is a whole number.
k) The whole number 13 lies between 11 and 12.
Ans. False. 13 comes after 12.
l) The whole number 0 has no predecessor.
Ans. True.
m) The successor of a two digit number is always a two digit number.
Ans. False. The successor of 99 is 100.