LCM means least common multiple(link). It is the smallest number which is in the table of the given numbers.

##
**
Find LCM of 4 & 6
**

**
**

**
**

LCM of 4 & 6 = 2 × 2 × 3

= 12

##
**
Find LCM of 12 & 16
**

**
**

**
**

LCM of 12 & 16 = 2 × 2 × 2 × 2 × 3

= 4 × 4 × 3

= 48

##
**
Find LCM of
**
**
20, 28, 36
**

**
**

**
**

LCM of 20, 28, 36 = 2 × 2 × 3 × 3 × 5 × 7

= 4 × 9 × 35

= 1260

##
**
Find LCM of
**
**
13 & 23
**

**
**

**
**

LCM of 13 & 23 = 13 × 23

= 299