1. The problem is to understand how to keep as many decimal places as possible during calculations. 2. When performing calculations, it is important to avoid rounding intermediate results too early. 3. The general rule is to carry all decimal places through each step and only round the final answer if necessary. 4. For example, if you multiply 1.2345 by 2.3456, keep the full precision: $$1.2345 \times 2.3456 = 2.8966322$$ 5. Do not round 2.8966322 to 2.90 or 2.9 until the very end. 6. This prevents loss of accuracy and ensures the final result is as precise as possible. 7. In summary, always keep all decimal places during intermediate steps and round only the final result if required.