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![](https://rs.olm.vn/images/avt/0.png?1311)
a) 25dam + 42dam = 67dam
83hm – 75hm = 8hm
13km x 5 = 65km
b) 672m + 314m = 986m
475dm – 56dm = 419dm
48cm : 6 = 8cm
![](https://rs.olm.vn/images/avt/0.png?1311)
8 hm = 800 m
8 m = 80 dm
9 hm = 900 m
6 m = 600 cm
7 dam = 70 m
8 cm = 800 mm
3 dam = 30 m
4 dm = 400 mm.
8 hm = 800 m
8 m = 80 dm
9 hm = 900 m
6 m = 600 cm
7 dam = 70m
8 cm = 800mm
3 dam = 30 m
4 dm = 400 mm
![](https://rs.olm.vn/images/avt/0.png?1311)
1km = 10 hm
1m = 10 dm
1km =1000 m
1 m =100 cm
1 hm =10 dam
1 m = 1000 mm
1hm =100 m
1 dm =10 cm
1 dam =10 m
1 cm =10 mm.
![](https://rs.olm.vn/images/avt/0.png?1311)
345+3339-647
=3684-647
=3037
234x6+847
=1404+847
=2251
64728+7369x7
=64728+51583
=116311
1000000000000000=1000000000000km
7548 mm=7.548m
7092 dm=70920cm
4628901 hm=46289010dam
348 mm=0.00348dam
![](https://rs.olm.vn/images/avt/0.png?1311)
15dam 5m = 155m
3km 5dam = 3005dam
7hm 50m = 120m
6m 7dm = 67dm
2km 5dam = 2005dam
20km 5hm = 205hm bạn nhé
_HT_
![](https://rs.olm.vn/images/avt/0.png?1311)
25 m x 2 = 50 m
15 km x 4 = 60 km
34 cm x 6 = 204 cm
36 hm : 3 = 12 hm
70 km : 7 = 10 km
55 dm : 5 = 11dm
25m x2 =50 m
15km x4 =60 km
34 cm x6= 204cm
96cm :3 =32 cm
36hm :3 =12 hm
70km :7 =10 km
55dm :5 =11 dm
![](https://rs.olm.vn/images/avt/0.png?1311)
1 dam = 10 m 5 dam = 50 m 1hm = 10 dam
1hm = 100 m 3hm = 300 m 5hm = 50 dam
1cm = 10 mm 2m = 20 dm 3m = 300 cm
nanh llen nha
75 hm = 7 km 50 dam
6030 mm = 6m 3 cm
300 cm = 30 dm
678m = 67 dam 80 dm
2100 = 21dam
957 = 95 hm 70 m