Subtracting by One 

Subtract Consecutively by One (2 rows) 

Subtract Consecutively by One (5 rows) 

Subtracting by Two 

Subtracting Half of a Double 

Subtracting with Zeros 

Subtracting with Twos 

Subtracting Doubles Plus One 

Subtracting from Ten 

Subtracting by Nine 

Subtraction Odd Balls 

Mixed (010) 

