估算下面各题：89×202≈139×48≈307×53≈801×72≈693×28≈890×12≈

Question

估算下面各题：

89×202≈	139×48≈	307×53≈
801×72≈	693×28≈	890×12≈

Answer 1

89×202≈90×200=18000
139×48≈140×50=7000
307×53≈310×50=15300
801×72≈800×70=56000
693×28≈700×30=21000
890×12≈900×10=9000