7,21 dam +3,6 m +16.400 mm. = .......dm

7,21 dam =......dm
7,21 x 100 = 721 dm

3,6 m=.......dm
3,6 x 10 = 36 dm

16400 mm =.......dm
16400 : 100 = 164 dm

Jadi 721+36+164 = 921 dm

Mengubah Satuan Jarak

7,21 dam = 7,21 × 100 = 721 dm
3,6 m = 3,6 × 10 = 36 dm
16.400 mm = 16.400 ÷ 100 = 164 dm

721 dm + 36 dm + 164 dm = 921 dm