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L per ubin=20 cm x 20 cm=400 cm2=0,04 m2
Jumlah ubin=24/0,04=600 ubin
kalikan ukuran lantai tersebut lalu bagikan
contoh=
4m-400cm
6m-600cm
=600×400
=240.000
lalu
=20×20
=400
maka
=240.000:400
=600
mka jumlah ubin tersebut ialah 600 buah
(maaf yaa kalau salah..)