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Subtraction with help

Instructions:

During subtraction we write subtrahend under minuend, and the result below the line.

91 - 32 = ?

 
9
1
=
 
+

-
3
2
 
-
3
2
 
 
 

 
 
 
 
 
 
 
 
 
 

 
=
 
 
+