Question

FILL IN THE BLANKS :

1)In 3 x 4 = 12 , _____ and ______ are the factors 12
2)In 6 x 8 = 48 , 48 is a __________ of 6 and 8
3) Two is the only even _________ number.
4) _____ is neither prime number nor composite number
5) Prime number has only two factors that are 1 and ________.

Do the following sums:

1) Find the H.C.F of 6, 12, 18 by prime factorisation method
2) Find the L.C.M of 4, 8 , 12 by prime factorization method

Answer 1

Answer:

Q. Fill in the blanks:

1. 3 and 4

2.

3. odd

4. 0

5. the no. itself

1) H.C.F of ( 6,12&18)

6=2x3

12=2x2x3

18=2x3x3

• therefore,HCF=2x3=6

2) L.C.M of (4,8&12)

4=2x2

=2²

8=2x2x2

=2³

12=2x2x3

=2²x3

therefore,LCM=2³x3

=8x3

=24.