壹、直接寫出得數
0.5×8= 3.6×0.4= 39.68×0= 47.6×1=
4÷0.5= 12÷0.06= 12÷1.2= 3÷30=
0.15×7= 3.2×6+3.2×4= 2.5×4×0.36=
0.2+0.8×0.5= 6.03×1000= 10×0.6= 6.45×0.01=
0.1×0.1= 0.24×0.5= 5.4＋3.6= 1.25－0.25=
10.2×4.5＝ 2.5×6＝ 9×0.25＝ 0.125×4=
1.25×8×0.5= 16×0.01= 1.78÷0.3= 0.27÷0.003=
0.01÷0.1= 1.8×20= x-0.4x= 5d-2d=
3.6÷0.4= 0.6×0.8＝ 2.4×3＝ 0.12×0.7＝
4÷5＝ 1.6÷0.5＝ 0.2÷0.05＝ 2.5×2.3×4=
1.5÷1.5＋1.5= 3.6－1.2÷2.4= 4.7×6＋4×4.7=
0.5×4÷0.5×4= 38.5×0×0.38= 0.6×0.8= 3×0.9=
2.5×0.4= 3.6×0.4 12.5×8= 50×0.04= 80×0.3= 1.1×9
二、用豎式計算
8.08－2.68＝ 5.546＋29.38＝ 17.04×0.26 ＝ 8.35×3.5＝
三、豎式計算（得數保留壹位小數）
0.43×0.29≈ 52.6×0.23≈ 4.58×0.37≈
四、豎式計算（得數保留兩位小數）
4.3×8.14≈ 27.6×0.45≈ 27.6×0.45≈
20÷12≈ 2.9×1.8≈ 5.08×0.25≈
五、豎式計算（得數保留三位小數）
2.5÷0.7= 2.5÷0.7= 3.25×9.04=
六、豎式計算（用循環小數表示商）
36.8÷16≈ 10.1÷3.3≈ 15.3÷11≈ 0.78÷1≈
七、脫式計算
（2.65+2.77）÷（1.98-0.98）= 3.7×91.6+6.3×91.6=
0.45×12×0.2= 6.2×2.1－2.12.8－2.8×0.15=
2.8×1.43＋0.57= 10－6.06＋8.5=
6×0.25×1.8= 144÷3.6＋27.2=
0.87×3.16+4.64= 6.8×0.75÷0.5=
13.75÷0.125–2.75= 53+23.4÷7.2=
2.881÷0.43－0.24×3.5= 28-(3.4+1.25×2.4)=
（31.8+3.2×4）÷5= 31.5×4÷(6+3)=
0.64×25×7.8+2.2= 2÷2.5+2.5÷2=
194－64.8÷1.8×0.9= 36.72÷4.25×9.9=
5180－705×6= 24÷2.4－2.5×0.8=
3.416÷（0.016×35）=
八、用簡便方法計算下面各題
5.12＋2.54＋4.88= 12.5×17.8×0.8= 9.9×2.5=
9.4×5.8＋10.6×5.8= 0.125×0.32×0.25= 9.6+9.6×99=
2.8×7.6+1.4×2.8 +2.8= 6.3×10.1= 0.25×3.2×12.5=
12.5×9.7?12.5×8.7= 3.7×91.6+6.3×91.6=
16.84÷40÷0.25= 12.5×0.4×2.5×8= 9.5×101=
4.2×7.8+2.2×4.2= 2.55×7.1+2.45×7.1=
九、解方程
4(x+0.3)=4.8 1.2x-0.8x=9.6 20+x=36
7x-55=59 0.7x=4.2 （10-7.5）x=1