2. Calculează :
a) 1800 dam+ 320hm- 28km = ? m
b) 4m + 32 dm =? dm
c) 17dm +19cm =?cm
1000m-50 dam =? dam
42m – 30 dm = ? m
415dm -70cm =? dm
5 x 368dam = ? dam = ? hm
6 x 22000mm = ? dm = ? m
8000mm: 2= ?mm = ? m​