一、口算。
$28 + 92 =$
$84 ÷ 2 =$
$35 × 2 =$
$78 ÷ 6 =$
$73 × 3 =$
$47 - 29 =$
$56 ÷ 4 =$
$30 × 30 =$
$108 ÷ 2 =$
$320 × 3 =$
$380 - 167 =$
$415 × 2 =$
$460 ÷ 2 =$
$21 × 40 =$
$540 ÷ 5 =$
$93 + 573 =$
$990 ÷ 3 =$
$131 × 4 =$
$13 × 50 =$
$300 × 9 =$
$36 × 30 =$
$61 × 30 =$
$120 ÷ 5 =$
$60 × 14 =$

一、120 42 70
13 219 18
14 900 54
960 213 830
230 840 108
666 330 524
650 2700 1080
1830 24 840

二、计算下面各题。
$35 × 6 × 9$
$14 × 5 × 37$
$24 × 20 × 4$
$5 × 16 × 11$
$40 × 13 × 5$
$15 × 4 × 74$

二、1890 2590 1920
880 2600 4440