Question

The child weighs 3 lb 12 oz. Convert this weight to kg: ________ (Round to the nearest tenth)

Answer 1

Answer: 1.7kg

Step-by-step explanation:

To convert the weight from pounds and ounces to kilograms, let's first convert pounds to kilograms and then add the conversion of ounces to kilograms.

1 pound is approximately 0.453592 kilograms.

So, for 3 pounds:

`\[ 3 \, \text{pounds} * 0.453592 \, \text{kg/pound} \approx 1.360776 \, \text{kg} \]`

Now, convert 12 ounces to kilograms. 1 pound is equivalent to 16 ounces, and 1 ounce is approximately 0.0283495 kilograms.


`\[ 12 \, \text{ounces} * (0.0283495 \, \text{kg/ounce} / 16) \approx 0.340194 \, \text{kg} \]`
Add these two results:

`\[ 1.360776 \, \text{kg} + 0.340194 \, \text{kg} \approx 1.70097 \, \text{kg} \]`
So, the weight of the child is approximately 1.7 kg (rounded to the nearest tenth).

Answer 2

To convert 3 pounds 12 ounces to kilograms, first convert the weight to ounces (60 oz), then multiply by the conversion factor (0.0283495 kg/oz) to get 1.70097 kg, which is rounded to the nearest tenth resulting in a final weight of approximately 1.7 kg.

Step-by-step explanation:

To convert the weight of 3 lb 12 oz to kilograms, first, we need to convert the weight entirely into ounces, and then convert these ounces into kilograms.

There are 16 ounces in a pound, so 3 lb is equivalent to 48 oz (3 lb x 16 oz/lb).

Adding the additional 12 ounces gives us a total weight of 60 ounces (48 oz + 12 oz).

To convert ounces to kilograms, we use the conversion factor that 1 ounce is approximately equal to 0.0283495 kilograms.

Therefore, 60 ounces is equal to 60 x 0.0283495 kg, which calculates to 1.70097 kilograms.

As we are asked to round to the nearest tenth, the final weight in kilograms is approximately 1.7 kg.

When converting measurements, it is essential to identify the least precise measurement and round your final answer to match this precision.

In our case, we are rounding off to the nearest tenth (0.1) in the final answer, consistent with the original precision of the measurements given.