MEDIUM
Earn 100

1 2 3 4 5 6 7 8 9 10
11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30
31 32 33 34 35 36 37 38 39 40
41 42 43 44 45 46 47 48 49 50
51 52 53 54 55 56 57 58 59 60
61 62 63 64 65 66 67 68 69 70
71 72 73 74 75 76 77 78 79 80
81 82 83 84 85 86 87 88 89 90
91 92 93 94 95 96 97 98 99 100

Based on the above chart answer the following question.

Which number is the smallest multiple of 5 and 8?

50% studentsanswered this correctly

Important Questions on HCF-LCM

HARD
Suppose a,b,c are positive integers such that 2a+4b+8c=328. Then a+2b+3cabc is equal to-
EASY

What is the LCM of x3+8, x2+5x+6 and x3+4x2+4x ?

HARD
The number of 6-digit numbers of the form ababab (in base 10) each of which is a product of exactly 6 distinct primes is
MEDIUM

What is the number of Prime factor in 1518×410×69.

EASY
The least number which is exactly divisible by 5, 6, 810 and 12 is:
EASY
Which of the following number is an odd and prime number?
EASY
If a and b are positive integers such that a2-b2 is a prime number, then
EASY

The sum of all the factors of 156 is: 
(A) 392
(B) 235
(C) 390
(D) 379

HARD
How many ordered pairs a,b of positive integers with a<b and 100a, b1000 satisfy gcda,b:lcma,b=1:495?
MEDIUM
What is the largest two-digit number which when divided by 6 and 7 gives the remainder 3 and 4 respectively?
EASY
How many two digit numbers are divisible by 9
MEDIUM
Find the LCM of 257, 1528, 2021,
EASY
The sum of the squares of the digits of the largest two-digit prime number is:
MEDIUM
For an integer n, let Sn=n+1,n+2,., n+18. Which of the following is true for all n10 ?
EASY

The total number of factors of 1156 is: 

(A) 9 

(B) 8 

(C) 10 

(D) 11 

EASY
Which of the following is not a pair of prime numbers ?
EASY

The prime factorisation of 240 is:

(A) 23×32×5 

(B) 24×32×5

(C) 24×3×5

(D) 25×3×5

 

EASY
How many numbers from 1 to 1000 are divisible by 23,4 and 5?
EASY
The least number which is exactly divisible by 4, 5, 8, 10, and 12 is _____.
EASY
If x is a prime number, LCM of x and its successive number would be: