3 dm + 54 m – 120 dm =…. = cm

3 dm+54 m-120 dm= … cm
3×10=30 cm
54×100=5400 cm
120×10=1200 cm
30+5400-1200=
5430-1200=
4230 cm

3 dm =…. Cm

3 × 10 = 30 cm

54 m =…. Cm

54 × 10 × 10 = 5400 cm

120 dm =…. Cm

120 × 10= 1200 cm

30 + 5400 = 5430 – 1200 = 4230 cm

Total 4230 cm