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Bonjour,

km | hm | dam | m | dm | cm | mm

a. 25 m + 3 hm = 25 m + 300 m = 325 m

b. 3 km + 7 dam = 3 000 m + 70 m = 3 070 m

c. 5 hm - 4 dam = 500 m - 40 m = 460 m

d. 6 km - 12 dam = 6 000 m - 120 m = 5 880 m

e. 13 km - 9 m = 13 000 - 9 m = 12 991 m

1: 25m + 300m =325m

2: 300dam +7dam= 307dam

3:500m - 40m= 460m

4:6000m -120m =5880m

5: 13000m -9m= 12991m