2 m 3 cm + 6 m 7 cm = 8 m 10 cm
3 m 14 cm + 9 m 7 cm = 12 m 21 cm
3 dm 4 cm + 7 m 6 cm = 7 m 3 dm 10 cm
5 m 8 dm - 42 cm 35 dm - 85 cm =
=580 cm - 392 cm - 85 cm =
= 188 cm - 85 cm
= 103 cm
5 km 400 m + 3 m 5 cm - 2 dm =
= 5 km 400 m 305 cm - 20 cm =
= 5 km 400 m 285 cm
8 km + 300 m +20 m 60 cm + 4 dm - 30 cm=
= 8 km + 320 m 60 cm + 40 cm - 30 cm =
= 8 km 320 m 70 cm