Question

Co the tinh nhanh tong 37+198 bang cach ap dung tinh chat ket hop cua phep cong

Answer 1

37 + 198 = (37 - 2) + (198 + 2) = 35 + 200 = 235

Answer 2

37 + 198 = 37 + 63 + 35 + 100

             = 100 + 100 +35

             = 200 + 35

             = 235    

Answer 3

37 + 198 = 37+ 63 + 35 + 100

              = 100 + 100 + 35

              = 200 + 35

              = 235  

Answer 4

\(37+198=37-2+198+2=35+200=235\)