alleryWhat is the HCF of 16, 72 and 28?
- 3
- 4
- 2
- 1
Show answer and solution
Correct answer: B. 4
1. 16 = 2^4, 72 = 2^3 x 3^2, 28 = 2^2 x 7.
2. The common prime factor is 2, lowest power 2^2 = 4.
3. So HCF = 4.
_Source: RRB Group D CEN-02/2018 PYQ, Q.25._
Accenture Hiring LCM and HCF — practice questions
Explore 7 free LCM and HCF questions in Accenture Hiring Mathematics. Open each question or exercise to read its content, reference answers and available explanation.
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Showing questions 1–7 of 7.
What is the HCF of 16, 72 and 28?Read the answer and worked solution →The HCF of 156, 312 and 195 is:Read the answer and worked solution →The least common multiple (LCM) of 14, 42 and 77 is:Read the answer and worked solution →The HCF of 96 and 404 is 4. Their LCM is:Read the answer and worked solution →The LCM of 6, 72 and 120 is:Read the answer and worked solution →What is the HCF of 96 and 404?Read the answer and worked solution →The smallest number that is exactly divisible by every number from 1 to 10 is:Read the answer and worked solution →
Worked practice questions
The HCF of 156, 312 and 195 is:
- 3
- 39
- 78
- 13
Show answer and solution
Correct answer: B. 39
1. 156 = 2^2 x 3 x 13, 312 = 2^3 x 3 x 13, 195 = 3 x 5 x 13.
2. Common factors are 3 and 13.
3. HCF = 3 x 13 = 39.
_Source: RRB Group D CEN-02/2018 PYQ, Q.64._
The least common multiple (LCM) of 14, 42 and 77 is:
- 308
- 462
- 154
- 168
Show answer and solution
Correct answer: B. 462
1. Prime factorise: 14 = 2×7, 42 = 2×3×7, 77 = 7×11.
2. LCM takes the highest power of each prime: 2 × 3 × 7 × 11.
3. = 462.
_Source: RRB Group D CEN-02/2018 PYQ, Q.8._
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