What is total kg in 6 lbs 9 oz?

Answer 1

Always start one of these conversions with mixed units by converting everything to the same unit. You can go either way.

6 lb x 16 oz/lb + 9 oz = 105 oz

or

6 lb + 9/16 lb = 6.5625 lb

Once you have you everything in the same units you can do the conversion...

6.5625 lb x 0.453592 kg/lb = 2.97669993 kg

Next, round your answer to the proper precision. Since your measurement of 6 lb was the least precise term (precise only to the units place), your final answer cannot be any more precise.

You will properly round the answer to 3 kg.

Unless the original measurement was a composite reading from a scale that had precision to the ounce. In that case, you have a very muddy task of converting precision to the decimal system. The precision of 1/16, to make things easier, is closer to 1/10, the tenths place than it is to 1/100, the hundredths place so, you would properly round the answer to the tenths place.

You will properly round the answer to 3.0 kg.