In order to find the least number of plums that can be shared, we have to find the greatest common factor of 6 ,9 and 12.
The greatest common factor of 6 , 9 and 12 is 3.
so if we have three plums.
For 6 children , we have 3 plums. So we can give half a plum to each child.
For 9 children , we have 3 plums. So we can give one third plum to each child.
For 12 children, we have 3 plums. So we can given one-fourth plum to each child.
This is how we can divide 3 plums equally among 3, 6 and 12 children.