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b.4 km= 400.000 cm
c.2 kg=2.000.000 g
a. Tebal buku⇒mm
b.Lebar ruangan kelas⇒ m3
c.Jarak antara 2 kota⇒m atau km
d.Jarak antara Bumi dan Pluto⇒tahun cahaya(22 thn cahaya)