Important Questions Test: Whole Numbers - Class 6 MCQ

# Important Questions Test: Whole Numbers - Class 6 MCQ

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## 20 Questions MCQ Test Mathematics (Maths) Class 6 - Important Questions Test: Whole Numbers

Important Questions Test: Whole Numbers for Class 6 2024 is part of Mathematics (Maths) Class 6 preparation. The Important Questions Test: Whole Numbers questions and answers have been prepared according to the Class 6 exam syllabus.The Important Questions Test: Whole Numbers MCQs are made for Class 6 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Important Questions Test: Whole Numbers below.
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Important Questions Test: Whole Numbers - Question 1

### Which is the whole number that does not have a predecessor?

Detailed Solution for Important Questions Test: Whole Numbers - Question 1

0 does not have a predecessor.

Important Questions Test: Whole Numbers - Question 2

### 3 x 10000 + 7 x 1000 + 9 x 100 + 0 x10 + 4 is the same as

Detailed Solution for Important Questions Test: Whole Numbers - Question 2

just multiply respective terms  and add respective terms

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Important Questions Test: Whole Numbers - Question 3

### The smallest whole number is

Detailed Solution for Important Questions Test: Whole Numbers - Question 3

The option (b) is the correct answer.

The smallest whole number is 0.

Important Questions Test: Whole Numbers - Question 4

The successor of 1 million is

Detailed Solution for Important Questions Test: Whole Numbers - Question 4

The option (c) is the correct answer.

We know that

1 million = 10, 00,000

So the successor of 1 million = 10, 00,000 + 1 = 10, 00,001

Important Questions Test: Whole Numbers - Question 5

The product of a whole number (other than zero) and its successor is

Detailed Solution for Important Questions Test: Whole Numbers - Question 5

The option (a) is the correct answer.

For Example-

Consider whole number = 1

So the successor of 1 = 1 + 1 = 2

Product between them = 1 × 2 = 2

Hence, 2 is an even number.

Important Questions Test: Whole Numbers - Question 6

The product of the predecessor and successor of an even natural number is

Detailed Solution for Important Questions Test: Whole Numbers - Question 6

The option (d) is the correct answer.

For example-

Consider an even natural number = 2

So the predecessor of 2 = 2 − 1 = 1

We get the successor of 2 = 2 + 1 = 3

Product between them = 1 × 3 = 3

Hence, the product is an odd number.

Important Questions Test: Whole Numbers - Question 7

If x and y are co-primes, then their LCM is

Detailed Solution for Important Questions Test: Whole Numbers - Question 7

The option (c) is the correct answer.

We know that the set of numbers which has common factor as 1 are called co-prime.

So the LCM of two co-prime numbers and their product are equal.

Important Questions Test: Whole Numbers - Question 8

The smallest number which is neither prime nor composite is

Detailed Solution for Important Questions Test: Whole Numbers - Question 8

The option (b) is the correct answer.

The smallest number which is neither prime nor composite is 1

Important Questions Test: Whole Numbers - Question 9

What is the predecessor of natural number 1?

Detailed Solution for Important Questions Test: Whole Numbers - Question 9

There is no predecessor for natural number 1. As natural number starts from 1

Important Questions Test: Whole Numbers - Question 10

Every counting number has an infinite number of

Detailed Solution for Important Questions Test: Whole Numbers - Question 10

The option (b) is the correct answer.

We know that we get multiples by multiplying the number by any number.

Hence, every counting number has an infinite number of multiples

Important Questions Test: Whole Numbers - Question 11

The least number divisible by each of the numbers 15, 20, 24 and 32 is

Detailed Solution for Important Questions Test: Whole Numbers - Question 11

The option (b) is the correct answer.

We know that the LCM of 15, 20, 24 and 32 is

15 = 3 × 5 = 31 × 51

20 = 2 × 2 × 5 = 22 × 51

24 = 2 × 2 × 2 × 3 = 23 × 31

32 = 2 × 2 × 2 × 2 × 2 = 25

So the LCM = 25 × 31 × 51 = 480

Important Questions Test: Whole Numbers - Question 12

How many whole numbers are there between 0 and 10?

Detailed Solution for Important Questions Test: Whole Numbers - Question 12

Concept:

Counting the whole numbers within the given range.

Solution:

⇒ The sequence of whole numbers between 0 and 10 is: 1, 2, 3, 4, 5, 6, 7, 8, 9

⇒ We simply need to count these numbers.

⇒ There is 1 one. ⇒ There is 1 two. ⇒ There is 1 three. ⇒ There is 1 four. ⇒ There is 1 five. ⇒ There is 1 six. ⇒ There is 1 seven. ⇒ There is 1 eight. ⇒ There is 1 nine.

by adding all the counts, we get 9 whole numbers between 0 and 10.

Hence, the correct answer is "9".

Important Questions Test: Whole Numbers - Question 13

Which of the following numbers is a prime number?

Detailed Solution for Important Questions Test: Whole Numbers - Question 13

We know that the factors of

91 = 1 × 7 × 13

81 = 1 × 3 × 3 × 3 × 3

87 = 1 × 3 × 29

97 = 1 × 97

Hence, 81, 87 and 91 are not prime numbers.

Important Questions Test: Whole Numbers - Question 14

a and b are two co-primes. Which of the following is/are true?

Detailed Solution for Important Questions Test: Whole Numbers - Question 14

We know that the set of numbers which has common factor as 1 are called co-prime.

LCM of two co-prime numbers and their product is equal.

So the HCF of two co-prime numbers is 1.

Important Questions Test: Whole Numbers - Question 15

Number of whole numbers between 38 and 68 is

Detailed Solution for Important Questions Test: Whole Numbers - Question 15

There 29 numbers between 38 and 68 . Hence the number of whole numbers between 38 and 68 are 29
use m - n - 1 for finding no of terms
= 68 - 38 - 1 = 29

Important Questions Test: Whole Numbers - Question 16

The greatest number which divides 134 and 167 leaving 2 as remainder in each case is

Detailed Solution for Important Questions Test: Whole Numbers - Question 16

Subtract the required remainder from 134 and 167.

So we get 132 and 165.

132 = 2 × 2 × 3 × 11 = 22 × 3 × 11

165 = 3 × 5 × 11 = 31 × 5 × 11

HCF = 3 × 11 = 33

Hence, the greatest number which divides 134 and 167 leaving 2 as remainder in each case is 33

Important Questions Test: Whole Numbers - Question 17

The product of successor and predecessor of 999 is

Detailed Solution for Important Questions Test: Whole Numbers - Question 17

Successor=1000
Predecessor=998
Product= 1000×998
= 998000

Important Questions Test: Whole Numbers - Question 18

The product of two numbers is 1530 and their HCF is 15. The LCM of these numbers is

Detailed Solution for Important Questions Test: Whole Numbers - Question 18

We know that the product of two numbers = HCF of two numbers × LCM of two numbers

By substituting the values

1530 = 15 × LCM of two numbers

We get

LCM of two numbers = 1530/15 = 102

Important Questions Test: Whole Numbers - Question 19

A whole number is added to 25 and the same number is subtracted from 25. The sum of the resulting numbers is

Detailed Solution for Important Questions Test: Whole Numbers - Question 19

Let the whole number be x
According to the question
= x + 25 + 25 - x
= 50

Important Questions Test: Whole Numbers - Question 20

The product of the predecessor and successor of an odd natural number is always divisible by

Detailed Solution for Important Questions Test: Whole Numbers - Question 20

We know that the predecessor of an odd number is an even number and the successor of an odd number is also an even number.

So the two even numbers and their product are two consecutive even numbers which is always divisible by 8.

## Mathematics (Maths) Class 6

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## Mathematics (Maths) Class 6

94 videos|347 docs|54 tests