Three kilogrammes is larger - it's 3,000 grammes.
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a gram is bigger than a kilogram
The second one.
If you convert to a common unit - either multiply kilograms by 1000 to convert to grams, or divide grams by 1000 to convert to kilograms - you can compare them, and see which one is bigger.
There are: 1250 grams in 1.25 kilograms
One kilogram is 1000 grams. So 4.7 kilograms is 4700 grams.