\set_margins 10
%f011
%uMultiplication%u%n%n

%f010
Multiplying by 10's%n%n

\set_margins 20
%f014
When 10 is a factor, the product is always the other factor (not 10) with a 0 added on the end.%n
If one factor is 100, then add two 0's.  If 1000, three 0's, and so on... %n%n

%n%n