1dm-2cm= 12cm+7cm= 2dm-2cm= 1m-1cm= 2cm4mm+3cm= 34mm+17mm= 6cm4mm+6mm= 1m-2dm=

1 dm - 2 cm = 10 cm - 2 cm = 8 cm;

12 cm + 7 cm = 19 cm;

2 dm - 2 cm = 20 cm - 2 cm = 18 cm;

1 m - 1 cm = 100 cm - 1 cm = 99 cm;

2 cm 4 mm + 3 cm = 24 mm + 30 mm = 54 mm;

34 mm + 17 mm = 51 mm;

6 cm 4mm + 6 mm = 64 mm + 6 mm = 70 mm = 7 cm;

1 m - 2 dm = 10 dm - 2 dm = 8 dm.