## Chapter 2: Whole Numbers

## Exercise 2.1

**Q1. Write the next three natural numbers after 10999. **

**Answer.**

10,999 + 1 = 11,000

11,000 + 1 = 11,001

11,001 + 1 = 11,002

**Q2. Write the three whole numbers occurring just before 10001. **

**Answer.**

10,001 – 1 = 10,000

10,000 – 1 = 9,999

9,999 – 1 = 9,998

**Q3. Which is the smallest whole number? **

**Answer.** ‘0’ (zero) is the smallest whole number.

**Q4. How many whole numbers are there between 32 and 53? **

**Answer.** 53 – 32 – 1 = 20

There are 20 whole numbers between 32 and 53.

**Q5. Write the successor of: **

**(a) 2440701 **

**(b) 100199 **

**(c) 1099999 **

**(d) 2345670 **

**Answer.**

(a) Successor of 2440701 is 2440701 + 1 = 2440702

(b) Successor of 100199 is 100199 + 1 = 100200

(c) Successor of 1099999 is 1099999 + 1 = 1100000

(d) Successor of 2345670 is 2345670 + 1 = 2345671

**Q6. Write the predecessor of: **

**(a) 94 **

**(b) 10000 **

**(c) 208090 **

**(d) 7654321 **

**Answer. **

(a) The predecessor of 94 is 94 – 1 = 93

(b) The predecessor of 10000 is 10000 – 1 = 9999

(c) The predecessor of 208090 is 208090 – 1 = 208089

(d) The predecessor of 7654321 is 7654321 – 1 = 7654320

**Q7. 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. **

**(a) 530, 503 **

**(b) 370, 307 **

**(c) 98765, 56789 **

**(d) 9830415, 10023001 **

**Answer.**

(a) Since 530 > 503

So 503 appear on left side of 530 on number line.

(b) Since 370 > 307

So 307 appear on left side of 370 on number line.

(c) Since 98765 > 56789

So 56789 appear on left side of 98765 on number line.

(d) Since 9830415 < 10023001

So 9830415 appear on left side of 10023001 on number line.

**Q8. Which of the following statements are true (T) and which are false (F): **

**(a) Zero is the smallest natural number. **

**(b) 400 is the predecessor of 399. **

**(c) Zero is the smallest whole number. **

(**d) 600 is the successor of 599. **

**(e) All natural numbers are whole numbers. **

**(f) All whole numbers are natural numbers. **

**(g) The predecessor of a two digit number is never a single digit number. **

**(h) 1 is the smallest whole number. **

**(i) The natural number 1 has no predecessor. **

**(j) The whole number 1 has no predecessor. **

**(k) The whole number 13 lies between 11 and 12. **

**(l) The whole number 0 has no predecessor. **

**(m) The successor of a two digit number is always a two digit number. **

**Answer.**

(a) False

(b) False

(c) True

(d) True

(e) True

(f) False

(g) False

(h) False

(i) True

(j) False

(k) False

(l) True

(m) False