SSC CHSL Number System Questions
4 questions on Number System for SSC CHSL, including questions from 2024 papers. Each comes with the correct answer and a worked explanation.
- Questions
- 4
- Moderate
- 4
Number System questions with solutions
The HCF and LCM of two numbers are 3 and 63 respectively. If one of the numbers is 9, what is the other number?
- (A)18
- (B)21
- (C)24
- (D)7
Show answer and explanation
Correct answer: (B) 21
For any two numbers, product of the numbers = HCF × LCM. So the other number = (3 × 63) ÷ 9 = 189 ÷ 9 = 21.
Shortcut: Other number = HCF × LCM ÷ given number.
The HCF and LCM of two numbers are 2 and 28 respectively. If one of the numbers is 4, what is the other number?
- (A)16
- (B)14
- (C)12
- (D)7
Show answer and explanation
Correct answer: (B) 14
For any two numbers, product of the numbers = HCF × LCM. So the other number = (2 × 28) ÷ 4 = 56 ÷ 4 = 14.
Shortcut: Other number = HCF × LCM ÷ given number.
The HCF and LCM of two numbers are 4 and 84 respectively. If one of the numbers is 12, what is the other number?
- (A)32
- (B)7
- (C)24
- (D)28
Show answer and explanation
Correct answer: (D) 28
For any two numbers, product of the numbers = HCF × LCM. So the other number = (4 × 84) ÷ 12 = 336 ÷ 12 = 28.
Shortcut: Other number = HCF × LCM ÷ given number.
The HCF and LCM of two numbers are 3 and 45 respectively. If one of the numbers is 9, what is the other number?
- (A)18
- (B)15
- (C)12
- (D)5
Show answer and explanation
Correct answer: (B) 15
For any two numbers, product of the numbers = HCF × LCM. So the other number = (3 × 45) ÷ 9 = 135 ÷ 9 = 15.
Shortcut: Other number = HCF × LCM ÷ given number.
Frequently asked questions
How many SSC CHSL Number System questions can I practise here?
4 questions — 4 moderate. 4 are shown on this page with answers and explanations, and the practice set draws from all of them.
How should I practise Number System for SSC CHSL?
Read through a few solved questions first to see the method, then take a timed practice set. Afterwards, check which questions you got wrong or spent longest on and redo those before moving on.