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Chú ý : Khi đo diện tích ruộng đất người ta còn dùng đơn vị héc-ta (ha)

1ha = 10000 m 2

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37 km2 06 hm2=...hm2

1 km² = 1 000 000 000 000 mm²

1km2=1 000 000 000 000mm2

1m2 = 100dm2 = 10000cm2 = 1000000 mm2

1km2 = 100ha = 1000000 m2

5m2 = 0,0005 hm2 = 0,0005 ha

6,8km2 = 680ha

7ha = 0,07 km2

1m² = 100dm² = 10000 cm² = 1000000mm²

1km² = 100ha = 1000000 m²

5m² = 0,0005hm² = 0,0005 ha

6,8km² = 680 ha

7ha = 0,07km²

1m2=100dm2=10000cm2=1000000mm2    ,

1km2=100ha=10000m2  ,

5m2=0,0005ha ,

6,8km2=680ha ,

7ha=0,07km2

mik nha

7ha

$a)$

$\circ 1m^2=100d{m}^2=10000c{m}^2=1000000m{m}^2$

GT: $1m^2=100d{m}^2$

$1d{m}^2=100c{m}^2$

$1c{m}^2=100m{m}^2$

$\circ 1ha=10000m^2$

$\circ 1k{m}^2=100ha=1000000m^2$

$b)$

$\circ 1m^2=0,01da{m}^2$

$\circ 1ha=0,01k{m}^2$

$\circ 1m^2=0,0001h{m}^2=0,0001ha$

GT: $h{m}^2=ha$

$\circ 4ha=0,04k{m}^2$

GT: $1ha=0,01k{m}^2$

$\circ 1m^2=0,000001k{m}^2$

a, 1m² = 100 dm² = 10000 cm² = 1000000 mmm²

   1ha = 10000 m² 

   1km² = 100 ha = 1000000m²

b, 1m² = \(\dfrac{1}{100}\) dam²

    1m² = \(\dfrac{1}{10000}\) hm² = \(\dfrac{1}{10000}\)ha

      1m² = \(\dfrac{1}{1000000}\)km²

         4ha = \(\dfrac{4}{100}\)km² = \(\dfrac{1}{25}\)km²

2cm2 =200mm2

3m2 495cm2=30495cm2

15000hm2=150km2

35160m2=3hm25160m2

2cm² =200 mm²

3m²495cm² =30495cm²

15000hm² = 150 km²

35160m2=3,5160 hm2 = 35160

K MÌNH NHÀ MÌH BIẾT CÓ VÀI CÂU MÌNH LÀM SAI

525cm

3km 256m

0,011kg

7kg 365g

a) 1m2 = 100dm2 = 10000cm2= 1000000mm2

1ha = 10000m2

1km2 = 100ha = 1000000m2

b)1m2 = 0,01dam2

1m2 = 0,0001hm2 = 0,0001ha

1m2 = 0,000001km2

1ha = 0,01km2

4ha = 0,04km2

2 = ...km2

1ha=...km2 

4ha=...km2

Bài 2:

Viết các số đo sau dưới dạng số đo có đơn vị là héc-ta:

a)  1 m²  =  100 dm²  =   10000 cm²  =   1000000 mm²

1 ha  =  10000 m²

1 km²  =   100 ha  =  1000000 m²

b)  1 m² =  0,01 dam²

1m²  =  0,000001 km²

1 ha  =   0,01km²

4 ha  =  0,04 km²

a) \(1m^2=100dm^2=10000cm^2=1000000mm^2\)

\(1ha=10000m^2\)

\(1km^2=100ha=1000000m^2\)

\(1m^2=100dm^2\)
\(1m^2=10000cm^2\)
\(1m^2=1000000mm^2\)
\(1m^2=0,01dam^2\)
\(1m^2=0,0001hm^2\)
\(1m^2=0,000001km^2\)

100dm2 

^10000cm2

0,01dam2

0,0001hm2

0,000001km2

1m2=100dm2

1m2=10000cm2

1m2=1000000mm2

1m2=****dam2

1m2=****hm2

1m2=*****km2

a) 7cm² 18mm²= 718 mm²

b)  810 ha = 8km²1000dam²

c) 49000dam²=4km²90ha

d) 9m² 35 cm²= 935 cm²

e) 11 ha 150m²= 110 150m²

f) 703 cm²=7dm²3cm²

20 dam=?hc

a)\(\frac{2}{5}dam^2=40m^2\)

\(\frac{3}{4}hm^2=7500m^2\)

\(\frac{5}{8}km^2=625000m^2\)

b)\(\frac{2}{5}m^2=40dm^2\)

\(\frac{3}{4}m^2=7500cm^2\)

\(\frac{5}{8}m^2=625000mm^2\)

#Y/n