Jawabanmu

2014-05-29T14:09:46+07:00
= 300 cm . 280 cm = 84000 cm2
= 20 cm . 20 cm = 400
ubin = 84000 : 400
       = 210 ubin
2014-05-29T14:10:46+07:00
Luas lantai = 3m × 2,8m = 8,4m = 84000 cm Luas ubin = 20cm × 20cm = 400 cm Banyak ubin = 84000 ÷ 400 = 210 ubin