4 kilograms is 4000 grams. the prefix "kilo" refers to thousand and the post-fix refers to gram hence 4000 grams! isn't the metric system so easy, everything is in factors of 10, 100 or 1000.
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4 kg
1 Kilogram equals 1000 grams so... 350 grams equals 0.350 kilograms
70 Kilograms
20 kilograms
10000 grams equals 10 kilograms.