1. 口算。（建议用时4分钟）
$7×60\% =$
$6.5×20\% =$
$60×30\% =$
$3.1×80\% =$
$2×72\% =$
$50×60\% =$
$1×25\% =$
$4×30\% =$
$32×75\% =$
$20\%×20\% =$
$3×37\% =$
$100×0.72\% =$
$35\%×2 =$
$7.5\%×10 =$
$70×40\% =$
$85\%×8 =$
$5×18\% =$
$22\%×4 =$
$50×40\% =$
$7×40\% =$
$\frac{3}{5}×40\% =$
$70\%×\frac{6}{7} =$
$80\%×\frac{9}{8} =$
$\frac{3}{4}×80\% =$

1. $7×60\% =4.2$
$6.5×20\% =1.3$
$60×30\% =18$
$3.1×80\% =2.48$
$2×72\% =1.44$
$50×60\% =30$
$1×25\% =0.25$
$4×30\% =1.2$
$32×75\% =24$
$20\%×20\% =0.04$
$3×37\% =1.11$
$100×0.72\% =0.72$
$35\%×2 =0.7$
$7.5\%×10 =0.75$
$70×40\% =28$
$85\%×8 =6.8$
$5×18\% =0.9$
$22\%×4 =0.88$
$50×40\% =20$
$7×40\% =2.8$
$\frac{3}{5}×40\% =0.24$
$70\%×\frac{6}{7} =0.6$
$80\%×\frac{9}{8} =0.9$
$\frac{3}{4}×80\% =0.6$

2. 填表。（建议用时1分钟）

2. 0.36 36% $\frac{13}{20}$ 65% $\frac{1}{8}$ 0.125 1.25 125% $\frac{3}{8}$ 0.375

3. 计算下面各题。(建议用时2分钟)
$\frac{5}{6}×\frac{3}{8}+\frac{3}{8}÷\frac{6}{7}$
$\frac{5}{8}-\frac{1}{4}×(\frac{8}{9}÷\frac{2}{3})$
$(\frac{1}{2}-\frac{1}{6})×60\%÷\frac{1}{5}$

3. $\frac{3}{4}$ $\frac{7}{24}$ 1

4. 解决问题。（建议用时3分钟）
我国素有“礼仪之邦”之称，茶文化博大精深，倒茶也是有礼仪的，给客人倒茶时应倒茶杯容量的70%～80%。如图，按这样的标准倒茶，这个茶壶最少可以倒多少杯？

100mL

4. $1.6\ \mathrm{L}=1600\ \mathrm{mL}$
$100×80\%=80(\mathrm{mL})$
$1600÷80=20(\mathrm{杯})$