What is the LCM and GCF of 25 and 70?

Answer 1

To find the HCF you first need to express the numbers as products of their prime factors. In this case we have:

18 = 2x3x3

70 = 2x5x7

The next step is to identify any common prime factors. In this case, both numbers have a 2 as a prime factor. Thus the HCF is 2. To find the LCM, you simply multiply the numbers together and divide by the hcf:

18x70/2 = 630

So the LCM is 360.

Answer 2

2 x 3 x 3 = 18

3 x 7 = 21

Combine the factors, eliminating duplicates.

2 x 3 x 3 x 7 = 126, the LCM

Answer 3

2 x 3 x 3 = 18

3 x 7 = 21

2 x 3 x 3 x 7 = 126, the LCM

Answer 4

LCM(Least Common Multiple) as the name suggests is the common multiple of two numbers. Thus, LCM of a single number cannot be found out.

Answer 5

The LCM is: 126.

Answer 6

3 and 126, respectively.

Answer 7

The LCM is 350.

The GCF is 5.