HCF & LCM
JKSSB Sub-Inspector (Executive) · Mathematics · 10 practice questions with answers and explanations: 0 Easy, 5 Medium, 5 Hard.
Sample questions
Sample Medium question 1
Find the greatest number that divides 245 and 1,029 leaving a remainder of 5 in each case.
- 32
- 8
- 12
- 16
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Answer: D. Subtract the remainder: 240 and 1,024. HCF(240, 1024) = 16.
Sample Hard question 2
Find the smallest 4-digit number that is exactly divisible by 12, 15 and 20.
- 1020
- 1000
- 1080
- 1200
Show answer
Answer: A. LCM(12, 15, 20) = 60. The smallest multiple of 60 that is at least 1,000 is 60 × 17 = 1,020.
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