Class 6 Maths Chapter 2 Whole Numbers
Exercise – 2.1
1. Write the next three natural numbers after 10999.
Solution: 10,999 +1 = 11,000
11,000 +1 = 11,001
11,001 +1 = 11,002
The next three natural numbers after 10,999 are 11,000; 11,001; 11,002
2. Write the three whole numbers occurring just before 10001.
Solution: 10,001-1 = 10,000
10,000-1 = 9,999
9,999-1 = 9,998
The three whole numbers occurring just before 10,001 are 10,000; 9,999; 9,998
3. Which is the smallest whole number?
Solution: 0 is the smallest whole number.
4. How many whole numbers are there between 32 and 53?
Solution: Since, 53- 32-1 = 20
There are 20 whole numbers between 32 and 53.
5. Write the successor of:
(1) 2440701
(2) 100199
(3) 1099999
(4) 2345670
Solution: (1) Successor of 2440701 is 2440701 +1 = 2440702
(2) Successor of 100199 is 100199 +1 = 100200
(3) Successor of 1099999 is 1099999 +1 = 1100000
(4) Successor of 2345670 is 2345670 +1 = 2345671
6. Write the predecessor of:
(1) 94
(2) 10000
(3) 208090
(4) 7654321
Solution:
(1) The predecessor of 94 is 94-1 = 93
(2) The predecessor of 10000 is 10000-1=9999
(3) The predecessor of 208090 is 208090-1 = 208089
(4) The predecessor of 7654321 is 7654321 -1 = 7654320
7. In each of the following pairs of numbers, state which whole number is on the left of the other number on the number line. Also write them with the appropriate sign (>, <) between them.
(1) 530,503
(2) 370,307
(3) 98765,56789
(4) 9830415,10023001
Solution: (1) 503 appears on left side of 530 on the number line. So, 530 > 503
(2) 307 appears on left side of 370 on the number line. So, 370 > 307
(3) 56789 appears on left side of 98765 on the number line. So, 98765 > 56789
(4) 9830415 appears on left side of 10023001 on the number line.
So, 9830415 < 10023001
8. Which of the following statements are true (T) and which are false (F)?
(1) Zero is the smallest natural number.
(2) 400 is the predecessor of 399.
(3) Zero is the smallest whole number.
(4) 600 is the successor of 599.
(5) All natural numbers .ire whole numbers.
(6) All whole numbers are natural numbers.
(7) The predecessor of a two digit number is never a single digit number.
(8) 1 is the smallest whole number.
(9) The natural number 1 has no predecessor.
(10) The whole number 1 has no predecessor.
(11) The whole number 1 3 lies between 11 and 12.
(12) The whole number 0 has no predecessor.
(13) The successor of a two digit number is always a two digit number.
Solution:
(1) False Since, zero is not a natural number.
(2) False Since, 400 is the successor of 399.
(3) True
(4) True
(5) True
(6) False
Since, all whole numbers are not natural numbers as 0 is a whole number but not a natural number.
(7) False
Since, predecessor of a two digit number i.e., 10 is a single digit number i.e., 9.
(8) False
Since, 0 is the smallest whole number.
(9) True
(10) False
Since, 0 is the predecessor of1 in whole numbers.
(11) False
Since, 13 lies between 12 and 14.
(12) True
(13) False
Since, successor of two digitnumber i.e.,
99 is a three digit number i.e., 100