Question

6.
The LCM and HCF of two rational numbers are equal, then the numbers must be
a) prime b) co-prime c) composite d) equal
7.
Two positive numbers have their HCF as 12 and their product as 6336. The number of pairs possible
for the numbers, is....
b) 3
c) 4
d) 5
a) 2
8.
If the LCM of a and 18 is 36 and the HCF of a and 18 is 2, then a = ...
a) 2
b) 3
c) 4
d) 1
9.
The least number that is divisible by all the numbers between 1 and 10 (both inclusive) is
a) 2520
b) 2450
c) 2420
d) 2250
10. The smallest number which gives remainders 8 and 12 when divided by 28 and 32 respectively is..
a) 180
b) 240
c) 204
d) 210
11 . The smallest 4 digit number divisible by 24,15 and 36 is
a) 1000
b) 1208
c) 1800
d)1080

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Answer 1

I think:
Ans1:prime number
Ans2:3
Ans3:2
Ans4:none of them
Ans5:??
Ans6:???