一、口算。
$66 + 19 =$
$44×5 =$
$23×3 =$
$0×51 =$
$72÷2 =$
$85 - 70 =$
$13×30 =$
$4×200 =$
$440÷4 =$
$400 - 18 =$
$260÷2 =$
$26×10 =$
$344×2 =$
$29×20 =$
$135÷5 =$
$30×81 =$
$580÷2 =$
$48×20 =$
$\frac{7}{10}-\frac{5}{10}=$
$\frac{3}{9}+\frac{5}{9}=$
$\frac{2}{7}+\frac{3}{7}=$
$\frac{7}{8}-\frac{3}{8}=$
$\frac{7}{8}-\frac{7}{8}=$
$\frac{2}{10}+\frac{1}{10}=$

一、85 220 69
0 36 15
390 800 110
382 130 260
688 580 27
2430 290 960

二、用竖式计算，带*的要验算。
$16×44$
$75×16$
*$59×63$
$73×22$
$80×52$
*$43×27$

二、704 1200 3717
1606 4160 1161