题目内容

口算．

0.5+0.75=24×数学公式=35÷数学公式=
1.89+1.11=30%÷数学公式=2数学公式÷数学公式=

0.5+0.75=1.25；                     24×=30；                     35÷=25；    
1.89+1.11=3；                           30%÷=1.2；                   2÷=2．
分析：①④题，注意小数点对齐；②约分计算；③把除法转化为乘法，约分计算；⑤把百分数化为小数，把除法改为乘法，再计算；⑥把带分数化为假分数，把除法转化为乘法，约分计算．
点评：此题考查了小数的数位对齐、分数乘法的约分以及分数除法与乘法的转化等．
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口算
0.16×5= 0.7÷0.01= 6.6÷0.66= 0.25×4=
1×0.1= 1.3×0.2= 4÷0.8= 5.1÷1.7=
口算．
0.3÷2=		 0.42+6= 0.46+23= 1.4×0.5=
7.2÷0.12= 1.1×2.1= 3.9÷1.3= 0.68÷4=
0.36÷0.04= 0.49÷0.7= 3.6×2= 0.78÷0.3=
口算
9.5×100=		 1.25×8 0.25×0.9×4= 1.87×0=
3.5-1.5= 1.2×0.4= 3.6×0.5= 0.6×5=
0.24+0.6= 0.64×0.03= 7.8+2.2-1.5= 8×0.05=
0.125×8= 1.3×4= 0.4×0.6= 3×0.08=
0.35×2= 2.9×0.3= 10-0.9= 5.67×0=
0.8×0.01= 2.5×0.2= 2.4×0.3= 1.6×0.25=
0.17×0.3= 15×0.01= 10×0.07= 0.7×0.05=
0.2×0.05= 7.8×0.01= 0.2×0.26= 0.04×4=
12.4+2.1= 0.08×0.5= 0.14×4= 9×2.5+9×1.5=
1.8×0.5= 2.3×5= 0.3×3.6= 8×0.9+8×2.1=
2.5×4= 0.8+2.7×2= 0.05×7= 4.8+2.1+7.9=
3.4-1.8= 2.5+0.2×2= 0.02×0.1= 5.4-2.8=
0.3×0.2= 3.5×2×0.1= 0.3×0.3= 0×10.3×2.2=
0.12×0.7= 0.2×0.5= 0.92×0.4= 6.7-1.43=
1.2×4= 1.3×2= 1.2×0.3= 4.6+5.08=

口算．
0.3÷2=		0.42+6=0.46+23=1.4×0.5=
7.2÷0.12=1.1×2.1=3.9÷1.3=0.68÷4=
0.36÷0.04=0.49÷0.7=3.6×2=0.78÷0.3=
口算。
2.7+1.2= 4.3-2= 5.6+3.2=
0.3+0.4= 0.9-0.2= 7.3-6.1=
2.7-2.4= 6+0.5= 6.5+0.5=
0.7+5.3= 9.6-0.5= 1.1-0.4=

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