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Test: HCF & LCM- 1


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10 Questions MCQ Test Mathematics for Class 5 | Test: HCF & LCM- 1

Test: HCF & LCM- 1 for Class 5 2022 is part of Mathematics for Class 5 preparation. The Test: HCF & LCM- 1 questions and answers have been prepared according to the Class 5 exam syllabus.The Test: HCF & LCM- 1 MCQs are made for Class 5 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: HCF & LCM- 1 below.
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Test: HCF & LCM- 1 - Question 1

Which of these are co-prime
(a) 16,18
(b) 11,48
(c) 8,23

Detailed Solution for Test: HCF & LCM- 1 - Question 1

In number theory, Co-prime numbers are those numbers if the only positive factor that divides them is 1.

Here,

Option A: (16,18) Factors that divide both of them are 1,2.

Option B: (11,48) Factor that divides both of them is 1.

Option C: (8,23) Factor that divides both of them is 1.

In reference to above definition both b and c are co-prime numbers.

Test: HCF & LCM- 1 - Question 2

3 is a factor of 36

Detailed Solution for Test: HCF & LCM- 1 - Question 2

The factors of 36 are 1, 2, 3, 4, 6, 9, 12, 18, and 36.

Hence, 3 is a factor of 36.

Test: HCF & LCM- 1 - Question 3

The LCM of two number is 84. Which one of the following can’t be their HCF.

Detailed Solution for Test: HCF & LCM- 1 - Question 3

LCM is divisible by HCF.

Hence, 8 cannot be the HCF  because 84 is not divisible by 8.

Test: HCF & LCM- 1 - Question 4

918573 can be divisible by 3

Detailed Solution for Test: HCF & LCM- 1 - Question 4

Using divisibility rule:

9+1+8+5+7+3 = 33,

33 is divisible by 3 ( 11×3)

So, 918573 is divisible by 3.

Test: HCF & LCM- 1 - Question 5

How many prime numbers are there between 1 and 100.

Detailed Solution for Test: HCF & LCM- 1 - Question 5

The Prime numbers between the numbers 1 to 100 are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97.

Here, we can see that the total count of prime numbers is 25.

Test: HCF & LCM- 1 - Question 6

1 is prime number

Detailed Solution for Test: HCF & LCM- 1 - Question 6

No, it is not a prime number.

Test: HCF & LCM- 1 - Question 7

The factor of a number is less than or equal to that number.

Detailed Solution for Test: HCF & LCM- 1 - Question 7

A factor of a number is always less than or equal to the given number. Every number except 0 and 1 has at least two factors, 1 and itself.

Test: HCF & LCM- 1 - Question 8

The LCM of two co- prime number is 176. If one number is 16, find the other number.

Detailed Solution for Test: HCF & LCM- 1 - Question 8

The product of 2 co-prime numbers is equal to their LCM.

Hence, if one number is 16 other one is 

Test: HCF & LCM- 1 - Question 9

HCF of co-prime no. is always

Detailed Solution for Test: HCF & LCM- 1 - Question 9
  • The HCF of two coprime numbers is always 1.
  • For example, 5 and 9 are coprime numbers, there, HCF (5, 9) = 1.
Test: HCF & LCM- 1 - Question 10

The HCF of two numbers is 6 and their LCM is 144. If one of the numbers is 36, the other is

Detailed Solution for Test: HCF & LCM- 1 - Question 10

Let the other number be x

Product of two numbers = HCF × LCM 

 x × 36 = 6 × 144

 

 Hence, the other number is x = 24

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