Greater in what way? They both have the same mass. Aluminium, being less dense will have a greater volume, but being more abundant will have a smaller value.
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hectogram = 100 grams centigram = one hundredth (10) of a gram
A decimgram is 1/10th of a gram, so there are 10 decigrams in one gram.
Both have the same density because density is not how large an object is, it is how much mass is in an area (how thick or dense it is), so since both bars are made of iron, both are just as dense, but the 10 meter bar has more volume because 10 is greater than 5.
A deciam, which is 1/10 of a gram.
1 mg = 0.001 gram 10 mg = 0.01 gram