Free interactive math game: Estimate Weight — How heavy is a cat?. Part of the Numbers Around Us category on MathKite.
Taken from the generator that powers this exercise. A fresh set appears every time the page is opened, and the printable worksheet holds ten of them.
Judging whether a mass should be given in grams or kilograms, and roughly how large it is.
Anchor yourself to things you have lifted. A bag of sugar is about a kilogram, a small coin is a few grams, and a person is tens of kilograms.
A bag of sugar is closest to 1 kg, not 1 g and not 100 kg.
Slipping between grams and kilograms. A thousand grams make one kilogram, so the wrong unit is out by a factor of a thousand.