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Mental arithmetic

Index - Options

89 - 47 = 
74 + 15 = 
57 - 5 = 
53 + 75 = 
41 + 69 = 
62 - 23 = 
107 - 21 = 
180 - 80 = 
73 - 1 = 
57 + 25 = 

When all exercises have been calculated correctly, a picture of an animal appears.

Time: Errors:

Options

Operations
Lower limit
Upper limit
 Addition
 Subtraction
 Multiplication
 Division
 Square
 Root

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