The prefix deka- means 10, so 1 dekagram equals 10 grams.
There are 100 dekagrams in one kilogram. This is because one kilogram is equal to 1,000 grams, and since a dekagram is equal to 10 grams, you can divide 1,000 grams by 10 grams to get 100 dekagrams.
Multiply by 10.
10000 grams equals 10 kilograms.
A decigram is 1/10 of a gram. However a Decagram is 10 grams.
It's not really proper to have two prefixes. deka and kilo. Deka means multiply by 10. Kilo means multiply by 1000, so 10,000 grams. The proper way would be 10 kilograms, or 1000 dekagrams.