Convert 1 kilogram into grams.
1 kg = $\editable{}$ g
Convert $80$80 millimetres to centimetres.
Convert $9000$9000 metres to kilometres.
Convert $7$7 kg and $258$258 grams to grams (g).
Multiply and divide decimal numbers by 10, 100, 1000, and 10 000 using mental strategies (e.g.,“To convert 0.6 m^2 to square centimetres, I calculated in my head 0.6 x 10 000 and got 6000 cm^2.”)