| Addition | Estimated Sum | 
|---|---|
| 5421 + 2357 = ? | 7778 | 
| 6245 + 1940 = ? | 8185 | 
| 5421 + 2357 = ? | 7778 | 
| 5421 + 2357 = ? | 7778 | 
| 5421 + 2357 = ? | 7778 | 
| 5421 + 2357 = ? | 7778 | 
| 5421 + 2357 = ? | 7778 | 
| 5421 + 2357 = ? | 7778 | 
| 35 + 644 = ? | 679 | 
| 45125 + 11067 = ? | 56192 | 
| 64191 + 19225 = ? | 83416 | 
| 16116 + 11209 = ? | 27325 | 
| 1012 + 1012 = ? | 2024 | 
| 5421 + 2357 = ? | 7778 | 
| 128 + 375 = ? | 503 | 
| 27056 + 35017 = ? | 62073 | 
| 76 + 24 = ? | 100 | 
| 217 + 82 = ? | 299 | 
| 54706 + 12553 = ? | 67259 | 
| 235 + 890 = ? | 1125 |