一、口算。
$35 + 47 =$ $60 ÷ 4 =$ $57 × 4 =$
$84 ÷ 3 =$ $73 × 3 =$ $92 ÷ 4 =$
$231 × 0 =$ $308 × 8 =$ $180 ÷ 9 =$
$123 + 230 =$ $630 ÷ 3 =$ $4 × 130 =$
$606 ÷ 2 =$ $8 × 210 =$ $116 - 50 =$
$560 ÷ 8 =$ $945 ÷ 9 =$ $205 - 130 =$
$105 × 5 =$ $142 × 2 =$ $568 ÷ 4 =$
$840 ÷ 2 =$ $124 ÷ 4 =$ $600 ÷ 5 =$

一、82 15 228
28 219 23
0 2464 20
353 210 520
303 1680 66
70 105 75
525 284 142
420 31 120

二、计算下面各题，带 * 的要验算。

二、721 604 267
93 960 102