Speedy subtracting 9
Subtracting 9 by subtracting 10 and adding 1.
            
          4 pages
        
            
        Speedy subtracting 9
Subtracting 9 by subtracting 10 and adding 1.
Subtracting 9 by subtracting 10 and adding 1.
Subtracting 9 by subtracting 10 and adding 1.