Subtraction with help

Example

70 - 12 = ?

 
7
0
=
 
+

-
1
2
 
-
1
2
 
 
 

 
 
 
 
 
 
 
 
 
 

 
=
 
 
+

Solution

70 - 12 = ?

 
7
0
=
 
2
0
+
5
0

-
1
2
 
-
1
2
 
 
 

 
 
 
 
 
 
 
 
 
 

 
5
8
=
 
 
8
+
5
0

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Subtraction with help
Subtraction with help

Number of exercises: