Calculează:
a) 6 dam + 23 m = ? m
12 km + 15 dam = ? m
12 hm + 63 dam = ? m
19 hm + 55 dam = ? m
192 m + 208 m = ? dam
20 dm + 32 cm = ? mm


b) 64 km - 22 dam = ? m
750 cm - 120 mm = ? mm
32 km - 21 dam = ? dam
1 m - 15 cm = ? cm
650 m - 1.500 dm = ? cm
8 km - 8 hm = ? dam​