Suma y resta reagrupando

 $58,894\ +\ 12,609\ =$  

• 86,681

• 71,503

• 71,228

 $20,931\ -11,945\ =$  

• 6,298

• 8,248

• 8,986

 $35,881\ +\ 92,218\ =$  

• 121,603

• 128,099

• 135,845

 $68,790\ -\ 47,007\ =$  

• 21,783

• 25,322

• 21,398

 $19,508\ +\ 31,069\ =$  

• 53,724

• 55,375

• 50,577

 $91,447\ -\ 23,016\ =$  

• 75,571

• 68,431

• 82,560

 $30,635\ -17,888\ =$  

• 17,184

• 12,747

• 15,989

 $14,707\ +\ 20,697\ =$  

• 38,428

• 31,529

• 35,404

 $15,339\ +\ 16,190\ =$  

• 31,529

• 38,428

• 35,404

 $82,603\ +\ 10,032\ =$  

• 92,635

• 82,560

• 72,571