一、口算。
$63 - 45 =$
$45 ÷ 3 =$
$32 × 3 =$
$34 ÷ 2 =$
$0 ÷ 70 =$
$37 + 26 =$
$35 × 6 =$
$96 - 27 =$
$84 ÷ 3 =$
$180 ÷ 3 =$
$4 × 220 =$
$13 × 30 =$
$7 × 108 =$
$560 ÷ 8 =$
$406 ÷ 2 =$
$61 × 40 =$
$122 × 4 =$
$40 × 30 =$
$490 ÷ 2 =$
$42 × 30 =$
$16 × 50 =$
$29 × 20 =$
$27 × 30 =$
$128 ÷ 8 =$

一、18 15 96
17 0 63
210 69 28
60 880 390
756 70 203
2440 488 1200
245 1260 800
580 810 16

二、计算下面各题。
$4 × 5 × 48$
$3 × 23 × 54$
$19 × 2 × 84$
$73 × 2 × 6$
$4 × 17 × 46$
$34 × 29 × 2$

二、960 3726 3192
876 3128 1972