Remember that there are 1000 g in 1 kg.
Sometimes it is easier to convert masses to grams before carrying out calculations, especially if the answer is to be given in grams.
Example
Work out 3 kg 625 g ÷ 5, giving your answer in grams.
Answer
First we convert 3 kg 625 g to grams, giving us 3625 g.
Then we divide,
The answer is 725 g.