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Transformati in centimetri:a ) 20 mm; 60 mm; 300 mm; 670 mm; b) 4 dm; 20 dm; 5 dm 3 cm; 7 dm 4 cm.

Răspuns :

20 mm=2 cm  
60 mm= 6 cm.
300 mm=30 cm
670 mm=67 cm
4 dm=400 cm
20 dm=2000 cm
5 dm= 500 cm
3 cm=30 cm
7 dm=700 cm