一、口算。
$93 - 28 =$ $52×3 =$ $13×8 =$
$37 + 45 =$ $91÷7 =$ $80×20 =$
$30×22 =$ $27×10 =$ $111×8 =$
$290×3 =$ $350÷7 =$ $70×20 =$
$90×10 =$ $150×4 =$ $23×30 =$
$3×220 =$ $20×22 =$ $43×20 =$
$22×40 =$ $109×7 =$ $242÷2 =$
$310÷2 =$ $20×32 =$ $165÷3 =$

一、65 156 104
82 13 1600
660 270 888
870 50 1400
900 600 690
660 440 860
880 763 121
155 640 55

二、用竖式计算。
$740×2$         $64×30$         $39×70$

$52×30$         $60×14$         $80×82$

二、1480 1920 2730
1560 840 6560