Question

Find lcm and hcf of 12 , 15, 21​

Answer 1

Answer:

420

Step-by-step explanation:

Divide your numbers by prime numbers as long as at least one of your numbers is evenly divisible by a prime number.

Division Table

2 12 15 21

2 6 15 21

3 3 15 21

5 1 5 7

7 1 1 7

1 1 1

Bring down any numbers that are not evenly divisible by the prime number.

When the last row of results is all 1's you are done.

Find the product of the prime numbers in the first column to get the LCM:

LCM = 2 x 2 x 3 x 5 x 7

LCM = 420

Therefore,

LCM(12, 15, 21) = 420

PLZ MARK AS BRAINLIEST IF YOU FIND THIS HELPFUL :)

Answer 2

Answer:

H.C.F=3

L.C.M=420

Step-by-step explanation:

12=2quare2×3

15=3×5

21=3×7

H.C.F=3

L.C.M=2square2×3×5×7

4×3×35

12×35=420