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                     Tonya Larsen
                    
                            Tonya Larsen
                    
                
                    
                
            
            
                
                    
                        Mental Math #5
                    
                
                
                    
                        Grades:
                        
                            
                                2nd Grade
                            
                        
                    
                    
                        Subjects:
                        
                            
                                Math
                            
                        
                    
                    
                    
                        Standards:
                        
                            
                        
                    
                    
                    
                        Student Instructions
                    
                 
             
            
                
                
                    Use the  tool to explain your thinking in solving this subtraction problem 145-20.
 tool to explain your thinking in solving this subtraction problem 145-20.