《2025年海淀单元测试AB卷六年级数学下册苏教版》

三、看清算式,仔细计算。(38分)
1. 直接写得数。(8分)
347 + 153 = 125÷25 = 20×5% = 1.5×4 + 6 =
1.01×99 = $\frac{1}{3}$ + $\frac{1}{5}$ = $\frac{5}{9}$÷$\frac{9}{5}$ = $\frac{8}{9}$÷2×0 =
$\frac{15}{26}$×$\frac{13}{25}$ = 20÷$\frac{4}{5}$ = 0.75 + $\frac{1}{4}$ = $\frac{5}{12}$×7.2 =
0.2×0.7÷0.2 = 0.6² = 0.5÷5% = $\frac{2}{7}$ + 2 - $\frac{2}{7}$ + 2 =

答案： 1. 500 5 1 12 99.99 $\frac{8}{15}$ $\frac{25}{81}$ 0 $\frac{3}{10}$ 25 1 3 0.7 0.36 10 4 

2. 用竖式计算。(带※的要验算)(12分)
※10 - 4.78 = 2.75÷0.25 = 416 + 398 =
※0.12×0.35 = 971÷70≈ 3.73×5.08≈
(得数保留两位小数) (得数保留两位小数)

答案： 2. 5.22 11 814 0.042 13.87 18.95 

3. 计算下面各题,能简算的要简算。(12分)
1.25×32×2.5 98÷$\frac{99}{98}$ 14.36 - (6.28 + 2.36) - 3.72
96×1.8 + 3×$\frac{9}{5}$ + 0.1×18 $\frac{9}{10}$×[$\frac{7}{8}$÷($\frac{4}{5}$ + $\frac{1}{4}$)] $\frac{1}{6}$ + $\frac{1}{12}$ + $\frac{1}{20}$ + $\frac{1}{30}$ + $\frac{1}{42}$

答案： 3. 1.25×32×2.5=(1.25×8)×(4×2.5)=10×10=100 98÷$\frac{99}{98}$=(99 - 1)×$\frac{98}{99}$=99×$\frac{98}{99}$ - $\frac{98}{99}$=97$\frac{1}{99}$ 14.36 - (6.28 + 2.36) - 3.72=14.36 - 2.36 - (6.28 + 3.72)=12 - 10=2 96×1.8 + 3×$\frac{9}{5}$ + 0.1×18=96×1.8 + 3×1.8 + 1×1.8=(96 + 3 + 1)×1.8=100×1.8=180 $\frac{9}{10}$×[$\frac{7}{8}$÷($\frac{4}{5}$ + $\frac{1}{4}$)]=$\frac{9}{10}$×[$\frac{7}{8}$÷$\frac{21}{20}$]=$\frac{9}{10}$×$\frac{7}{8}$×$\frac{20}{21}$=$\frac{3}{4}$ $\frac{1}{6}$ + $\frac{1}{12}$ + $\frac{1}{20}$ + $\frac{1}{30}$ + $\frac{1}{42}$=$\frac{1}{2}$ - $\frac{1}{3}$ + $\frac{1}{3}$ - $\frac{1}{4}$ + $\frac{1}{4}$ - $\frac{1}{5}$ + $\frac{1}{5}$ - $\frac{1}{6}$ + $\frac{1}{6}$ - $\frac{1}{7}$=$\frac{1}{2}$ - $\frac{1}{7}$=$\frac{5}{14}$ 

4. 求未知数x。(6分)
x∶3.5 = 2∶14 $\frac{4}{5}$x - $\frac{1}{3}$x = $\frac{14}{15}$ ($\frac{1}{2}$ + 0.4)×80%x = 4.32

答案： 4. x = 0.5 x = 2 x = 6