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

\set_margins 10
%f010
Multiplying by 4%n%n

\set_margins 20
%f014
Think of doubling a double.%n%n

%f015
%t050  4 x  8 = ?%n
%t050  8 +  8 = 16 (double 8)%n
%t050 16 + 16 = 32 (double 16)%n%n

%t050 4 x 3 = ?%n
%t050 3 + 3 = 6 (double 3)%n
%t050 6 + 6 + 12 (double 6)%n%n%n

%n%n