Question

12,13 and 21 hcf and lcm​

Answer 1

Answer:

HCF = 3

LCM = 420

Step-by-step explanation:

hey...here's ur solution ,

12 = 2× 2 × 3

15 =3×5

21 = 3× 7

hence ,

HCF = 3

LCM = 2×2×3×5×7

= 420.

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Answer 2

Answer:

HCF =12 13 ,21

12=2×2×3×1

13= 13×1

21= 3×7×1

common factor or HCF of 12,13 ,21 is 1

LCM

2 12,13,21

2 6,13 ,21

3 3,13 ,21

7 1 ,13 ,7

13 1 ,13 ,1

1 , 1 ,1

Ans = 2×2×3×7×13

4×21×13

=84×13

1008