Express 160 pounds in kilograms. Round your final answer 2 decimal places
The correct answer and explanation is:
Correct Answer:
160 pounds = 72.57 kilograms
Explanation (300 Words):
To convert pounds (lb) into kilograms (kg), we use the standard conversion factor:
1 pound = 0.45359237 kilograms
So, to convert 160 pounds into kilograms, multiply: 160 pounds×0.45359237 kgpound=72.5747792 kg160 \, \text{pounds} \times 0.45359237 \, \frac{\text{kg}}{\text{pound}} = 72.5747792 \, \text{kg}
Now, we round the answer to 2 decimal places: 72.5747792≈72.57 kg72.5747792 \approx \boxed{72.57 \, \text{kg}}
Why this conversion matters:
Pounds and kilograms are units of mass, but they are used in different systems. Pounds are part of the imperial system, which is common in the United States, while kilograms are used in the metric system, which is standard in most other countries and in scientific contexts.
Accurate unit conversion is important in many areas such as:
- Medicine (e.g., determining drug dosages by weight)
- Fitness and health (e.g., tracking body weight)
- International shipping (e.g., calculating cargo weight)
- Science and engineering (where SI units like kilograms are standard)
Rounding Rules Recap:
When rounding to two decimal places:
- Look at the third digit after the decimal.
- If it’s 5 or higher, round the second digit up.
- If it’s 4 or lower, keep the second digit as is.
In this case: 72.5747792→72.5772.5747792 \rightarrow \boxed{72.57}
Thus, 160 pounds is approximately 72.57 kilograms.