♥284 m + 79 m= 363 m
♥792 m -320 m= 472 m
♥468 cm + 32 cm = 500 cm = 5 m
♥268 hl - ? hl=20 kl
20 kl = 200 hl
268 hl - ? hl = 200 hl
268 hl - 68 hl = 200 hl
♥924 dm - ? dm = 2 m
2 m = 20 dm
924 dm - ? dm = 20 dm
924 dm - 904 dm = 20 dm
♥45 min+? min= 3 h
3 h = 3 * 60 = 180 min
45 min + ? min=180 min
45 min + 135 min = 180 min