\set_margins 10
%f011
%uSubtraction%u%n%n

\set_margins 10
%f010
Counting Up%n%n

\set_margins 20
%f014
Use this strategy when the numbers subtracted are close
 together.%n%n

\set_margins 20
Find 8 - 6 by counting. Start with the smaller number, 6.
 Count up to the larger number, 8. You counted up 2 steps.

\image subcntup.pcx

%n%n