**Category : **5th Class

Face value of a number is the number itself.

**In the number 874. Face value of 8 is 8 itself. Face value of 7 is 7 itself. Face value of 4 is 4 itself.**

**Successor**

Successor of a number comes just after the number. In other words when we add a number by 1, the resulting number is the successor of that number. Like P is a whole number, then P + 1 is successor of P.

**Find the successor of 523604**

**Solution:**

523604+1=523605

Thus 523605 is the successor of 523604

**Predecessor**

Predecessor of a number comes just before the number. In other words when we reduce a number by 1, the resulting number is the predecessor of that number. For example, P is a whole number then P - 1 is the predecessor of P.

**Find the predecessor of 986546**

**Solution:**

986546 - 1= 986545

Thus 986545 is the predecessor of 986546.

- 0 was invented by Aryabhata.
- Number system is based on the place value system. If places of the digits in a number are changed, the number will change.
- Predecessor of the smallest natural number is the smallest whole number.
- Successor of the smallest whole number is the smallest natural number.
- First digit of every numeral is always at unit place but first digit from left has net a fixed place.

- Numbers are mathematical objects by which we express date, time, distance, position, quantity, etc.
- Number system is a set of numbers where numbers are related with each ether by one or more algebraic operations.
- Lakhs, creres, arabs, etc. are the periods which are used in the Indian system of numeration.
- Millions, billions, trillions, etc. are the periods which are used in international system of numeration.
- Successor of a number is greater than the number by
- Predecessor of a number is smaller than the number by 1.

**Which one of the following numbers is a whole number as well as a natural number?**

(a) 3

(b) 8

(c) 100

(d) All of these

(e) None of these

**Answer (d)**

**Explanation**

All the whole numbers are also natural numbers except 0.

**Which one of the following is not true?**

(a) Greatest natural number cannot be found

(b) Smallest natural number is 1

(c) 35 is not an integer

(d) 0 is the smallest whole number

(d) None of these

**Answer: (c)**

**Explanation**

All the whole numbers are also integers. Therefore, 35 is also an integer.

**Jack has prepared some sets of numbers which has been given below. Which one of the following sets is the set of integers?**

(a) {0, 1, 2, 4, 8, 16, 32}

(b) {3, 6, 9, 12, 15}

(c) {-4, -3, -2, -1, 0, 1, 2, 3, 4}

(d) {9, 4, 8, 3, 2}

(e) All of these

**Answer (e)**

**Make a set of the numbers which comes between 20 to 58. First member of the set belongs to____.**

(a) Natural number

(b) Whole number

(c) Integer

(d) All of these

(e) None of these

**Answer (d)**

**P is an integer. Choose the correct option about P.**

(a) P is only a negative whole number

(b) P is only a negative natural numbers

(c) P+(-P) is a whole number

(d) P-P is a natural number

(e) None of these

**Answer: (c)**

**If the place value of 8 in a number is 80000, what place does 8 occupies in the number?**

(a) Thousands

(b) Ten thousands

(c) Lakhs

(d) Crores

(e) None of these

**Answer: (b)**

**Explanation**

From the right 8 is at the fifth position and in the place value chart fifth position from the right is the position of ten thousands.

**If X million is equal to 50 lakh then X =?**

(a) 10

(b) 5

(c) 50

(d) 500

(e) None of these

**Answer: (b)**

**Explanation**

10 akh = 1 million, 50 lakh =5 million

**You have to place a digit in a number such that place value and face value of the digit in the number is equal. At which one of the following places will you place the digit?**

(a) Thousands

(b) Tens

(c) Hundreds

(d) Ones

(e) None of these

**Answer: (d)**

**Jack:** If we find the place value of each digit of a number and add them then result will be equal to the number.

**Codi:** If there is 0 in the middle of the number then you will be wrong. Who is correct?

(a) Jack

(b) Codi

(c) Both are correct

(d)Both are partially incorrect

(e) None of these

**Answer: (b)**

**Find the sum of the place value of X and Y in the number 1X0078Y5. If X = Y=2**

(a) 2000020

(b) 20020000

(c) 2000002

(d) 2200000

(e) None of these

**Answer: (a)**

**P is a natural number which represents 5 digit greatest number. Which one of the following is the successor of P?**

(a) 99999

(b) 10000

(c) 100000

(d) 100001

(e) None of these

**Answer: (c)**

**Explanation**

5 digits greatest number = 99999 Successor of 99999 = 99999 + 1 = 100000

**Predecessor of a number, lies ..... to the number on the line.**

(a) Left

(b) Right

(c) Either side

(d) Centre

(e) None of these

**Answer: (a)**

**Explanation**

Predecessor of a number is smaller than the number. Therefore, it lies left to the number on the number line.

**"Predecessor of n-digit smallest number is (n - 1)". The above statement is: **

(a) Correct

(b) Incorrect

(c) Partially correct

(d) All of these

(e) None of these

**Answer: (a)**

**Q is a natural number. Find the difference between successor and predecessor of Q**

(a) 0

(b) 1

(c) 2

(d) 3

(e) None of these

**Answer: (c)**

**Which one of the following is not true?**

(a) Sum of successor and predecessor of a number is twice of that number

(b) Successor of a number is always greater than the number

(c) Predecessor of the smallest natural number is the smallest whole number

(d) Predecessor of a number is either smaller or equal to the number

(e) None of these

**Answer: (d)**

*play_arrow*Number System*play_arrow*Introduction*play_arrow*Numbers*play_arrow*Number System*play_arrow*Face Value*play_arrow*Place Value*play_arrow*System of Numeration

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