First off, you cannot associate weight and length without knowing the shape, other dimensions and density. However, if you happened to have two units with the same suffix (gram) deci would be 100 times milli (gram) so deci would be larger.
kilogram
hectogram
A decimeter is larger than a decigram. A decimeter is a unit of length equal to one-tenth of a meter, while a decigram is a unit of mass equal to one-tenth of a gram. Since length and mass are different types of measurements, they cannot be directly compared, but in their respective systems, a decimeter represents a larger quantity than a decigram does.
1 dekagram = 100 decigrams.
Gram
Decigram is larger. Deci = 1/10 Micro = 1/1000000
Hectogram.
kilogram
A Killogramn is bigger than a Hectogram, but a Hectogram is bigger than a Decigram
hectogram
A decimeter is larger than a decigram. A decimeter is a unit of length equal to one-tenth of a meter, while a decigram is a unit of mass equal to one-tenth of a gram. Since length and mass are different types of measurements, they cannot be directly compared, but in their respective systems, a decimeter represents a larger quantity than a decigram does.
1 dekagram = 100 decigrams.
Gram
millimeter
A centimeter is 10 times larger than a millimeter.
It is .25 mm that is the larger diameter
Decagram if going from larger unit to smaller unit, and decigram if from smaller to larger.