How do you calculate the least common multiple of 3 numbers?

Answer 1

The same as with 2. Example: 30, 42 and 56

Factor them.

2 x 3 x 5 = 30

2 x 3 x 7 = 42

2 x 2 x 2 x 7 = 56

Combine the factors, eliminating duplicates.

2 x 2 x 2 x 3 x 5 x 7 = 840, the LCM

Answer 2

The same as with two.

Example: 30, 42, 54

Factor them.

2 x 3 x 5 = 30

2 x 3 x 7 = 42

2 x 3 x 3 x 3 = 54

Select the highest amount of each factor.

2 x 3 x 3 x 3 x 5 x 7 = 1890, the LCM

Answer 3

The same as with two.

Example: 30, 42, 48

Factor them.

2 x 3 x 5 = 30

2 x 3 x 7 = 42

2 x 2 x 2 x 2 x 3 = 48

Select the highest amount of each factor.

2 x 2 x 2 x 2 x 3 x 5 x 7 = 1680, the LCM

Answer 4

The same as with two.

Example: 30, 42, 48

Factor them.

2 x 3 x 5 = 30

2 x 3 x 7 = 42

2 x 2 x 2 x 2 x 3 = 48

Select the highest amount of each factor.

2 x 2 x 2 x 2 x 3 x 5 x 7 = 1680, the LCM