20 is written as the product of primes as:

LCM of two numbers = ____________________

Least common multiple of 4 and 9 is

H.C.F. of two co-prime numers is _____________

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

What is the least numbers of choclates a teacher should have to equally distribute among 10, 15 or 20 students

Given below is the procedure to find the L.C.M by prime factorisation method.

• A: Select the greatest power of every prime factor.
• B: Express each number as a product  of prime factors .
• C: The product of these prime factors with their greatest power is the L.C.M of the given numbers.

Reat the steps by step procedure and arrange the correct order of steps by choosing the correct option.

Match the following.

H.C.F of 36 and 144 is ____________

Column - I                                                                                                                         Column - II

(A) The L.C.M of two prime numbers 'a' and 'b' (a>b) is 161. The value of 3b - a is                      (p)  322

(B) H.C.F of 4 X 27 X 3125,                                                                                                            (q) 130 

       8 X 9 X 25 X 7 and 16 X 81 X 5 X 11 X 49 is

(C) If the H.C.F of two numbers (each greater than 13) be 13 and the L.C.M be 273,                         (r)  -2

        then the sum of numbers is

(D) The H.C.F of two numbers is 23 and the other two

factors of their L.C.M are 13 and 14. The larger of the two number is                                             (s)  180

Choose the correct option: