HCF and LCM Practice Question and Answer
8 Q: Three Alarm make a beep after every 48 sec, 72 sec and 108 sec respectively. They beeped together at 10 a.m. The time when they will next make a beep together at the earliest is
838 05f40d8e8b8958f14fa2af581
5f40d8e8b8958f14fa2af581- 110:07:36 hrsfalse
- 210:07:24 hrsfalse
- 310:07:12 hrstrue
- 410:07:48 hrsfalse
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Answer : 3. "10:07:12 hrs"
Q: a and b are two whole numbers and c is their HCF, then the LCM of those two numbers is
828 061bac36539095b5c3063b0e1
61bac36539095b5c3063b0e1- 1ab/ctrue
- 2abcfalse
- 3bcfalse
- 4ac/bfalse
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Answer : 1. "ab/c"
Q: The product of two number is 4107. If the HCF of the number is 37. The greatest number is
826 05ec4a2bc980ff60a66c065a6
5ec4a2bc980ff60a66c065a6- 1185false
- 2111true
- 3107false
- 4101false
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Answer : 2. "111 "
Q: If the product of three consecutive numbers is 210 then sum of the smaller number is:
822 05f0823018e448621429eabd3
5f0823018e448621429eabd3- 15false
- 211true
- 33false
- 44false
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Answer : 2. "11"
Q: Three numbers are in the ratio of 3:5:10 and their LCM is 630. Find their HCF.
821 060701683dac3665e58b1d1ca
60701683dac3665e58b1d1ca- 121true
- 242false
- 363false
- 436false
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Answer : 1. "21"
Q: The product of two numbers is 2028 and their HCF is 13. The number of such pair is-
821 0608f95128899c91069dac6c9
608f95128899c91069dac6c9- 11false
- 22true
- 33false
- 44false
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Answer : 2. "2"
Q: The HCF and LCM of two numbers are 21 and 4641 respectively. If one of the numbers lies between 200 and 300, then the two numbers are-
819 0600a9f20bc7633585f489302
600a9f20bc7633585f489302- 1273, 357true
- 2273,361false
- 3273, 359false
- 4273, 363false
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Answer : 1. "273, 357"
Q: The least multiple of 7, which leaves the remainder 4, when divided by any of 6, 9, 15 and 18, is
818 05f07fd45429a37679ec0cb8d
5f07fd45429a37679ec0cb8d- 1184false
- 2364true
- 376false
- 494false
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