1 km = 10 hm
1 hm = 10 dam
1 dam = 10 m
1 m = 10 dm
1 dm = 10 cm
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Materi : Pengukuran
Kata Kunci : satuan ukuran, panjang, waktu
Pembahasan :
Satuan ukuran panjang, antara lain : kilometer, hektometer, dekameter, meter, desimeter, centimeter, milimeter.
Setiap turun 1 tingkat dikali 10 dan setiap naik 1 tingkat dibagi 10.
1 km = 10 hm
1 hm = 10 dam
1 dam = 10 m
1 m = 10 dm
1 dm = 10 cm
1 cm = 10 mmSatuan ukuran waktu, antara lain : jam, menit, dan detik.
1 jam = 60 menit.
1 menit = 60 detik.
Mari kita lihat soal tersebut.
20 m/detik = ... km/jam.
Jawab :
1 km = 1.000 m
⇔ 1 m = km.
⇔ 20 m = 20 x = = 0,02 km.
1 jam = 60 x 60 = 3.600 detik.
⇔ 1 detik = jam.
20 m/detik
=
= x
= 72 km/jam.
Jadi, 20 m/detik = 72 km/jam.
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