Gram, unless you have a ruler the size of a truck, then it might be a kilogram :)
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One kilogram has 1,000 grams in it. The word kilo=one thousand+gram. One gram is 1/1000 kilogram.
1 kilogram is 1000 grams and 1000000 milligram.
Paper comes in a variety of thicknesses and sizes, so the weight of 4 sheets of paper is not a fixed quantity - although you might narrow it down by stating, the weight of 4 sheets of regular photocopy paper, in which case the answer is, it weighs more than a gram, but it's much closer to a gram than it is to a kilogram.
Kilo means thousand, so a Kilogram is 1000 grams.
One kilogram of meat (or anything else for that matter) weighs one kilogram.