Compute 617 + 6.017 + 0.617 + 6.0017.

Problem restatement
Add four decimals accurately by aligning place values.

Step-by-step calculation
617 + 6.017 = 623.017623.017 + 0.617 = 623.634623.634 + 6.0017 = 629.6357

Common pitfalls
Misaligning decimal places or dropping a trailing digit (the 7 in 6.0017).

Final Answer
629.6357