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1
In which of the following Prime Factorisation is not completed ?
70 = 2 X 5 X 7
28 = 2 X 2 X 7
48 = 2 X 2 X 2 X 2 X 3
108 = 2 X 2 X 27
2
Prime factors of 140 are:
2 X 2 X 7
2 X 2 X 5
2 X 2 X 5 X 7
2 X 2 X 5 X 7 X 3
3
Consider the following statements.
(i) If L.C.M. of two numbers 6 and 8 is 24, then their H.C.F. is 2.
(ii) First number X Second number
= L.C.M X H.C.F
Which of the above statement (s) is /are correct
Only (i)
Only (ii)
Both (i) and (ii)
Neither (i) nor (ii)
4
Least common multiple of 4 and 9 is
32
40
45
36
5
What is the smallest common multiple of 6, 5 and 8?
90
120
60
None of these
6
A prime number has two factros 1 and the number itself. Which one of the following is correct about the prime factors of greatest number of two digit?
3 X 3 X 11 X 11
3 X 3 X 11 X 21
3 X 3 X 11
All of these
7
Find the least number which is exactly divisible by 4,6 and 8.
112
34
24
12
8
What is the least numbers of choclates a teacher should have to equally distribute among 10, 15 or 20 students
30
50
9
L.M.C. of 17 and 5 is:
105
95
85
10
HCF and LCM of two number are 12 and 72 respectively. If the difference of the number is 60, then the large number is ________________
72
11
Find the greatest number which when divides 150 and 392 leaves remainders 4 and 6 respectively.
15
Prime factorisation of 143 are:
2 X 11 X 13
11 X 13
2 X 3 X 7
13
Given below is the procedure to find the L.C.M by prime factorisation method.
Reat the steps by step procedure and arrange the correct order of steps by choosing the correct option.
ABC
BCA
BAC
CAB
14
H.C.F. of two co-prime numbers is ___________________
Product of numberstheir L.C.M.
Product of numbers X their L.C.M.
Product of numbers
none of these
L.C.M. of two co-prime numbers is their:
sum
difference
product
quotient