97 + 19 = 97 + 3 + 16 = 100 + 16 = 116

37 + 198 = 2 + 198 + 35 = 200 + 35 = 235 

448 + 66 = 448 + 2 + 64 = 500 + 64 = 564

996 + 45 = 996 + 4 + 41 = 41 + 1000 = 1041

45 + 298 = 298 + 2 + 43 = 43 + 300 = 343

288 + 37 = 288 + 2 + 35 = 35 + 300 = 335

`a)` 
`97 + 19 = 100 + 16 = 116` 
`37 + 198 = 35 + 200 = 235` 
`448 + 66 = 500 + 14 = 514` 
`b)` 
`996 + 45 = 1000 + 41 = 1041` 
`45 + 298 = 43 + 300 = 343` 
`288 + 37 = 300 + 25 = 325`