It is bigger by a factor of 4 kg/45 grams = 4000 g/45 g = 88.88... (recurring).
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Fatima weighs 45 kilograms, not grams. To convert grams to kilograms, you divide by 1000. So, Fatima actually weighs 0.045 kilograms.
The box of cereal weighs 0.45 kilograms.
450 grams is 450/1000 or 225/500 or 45/100 or 9/20 (9/20 being simplest form) are some ways to represent it as a fraction of a kilogram.
Hilda's weight after losing x kilograms would be 45 - x kilograms.
There are 1000000 milligrams in one kilogram. Therefore, 45 kilograms is equal to 45 x 1000000 = 45000000 milligrams.