一、口算。
$65 - 47 =$ $76 ÷ 2 =$ $47 + 73 =$
$83 × 2 =$ $2 × 52 =$ $63 ÷ 3 =$
$84 ÷ 2 =$ $71 - 18 =$ $32 × 4 =$
$36 + 82 =$ $60 ÷ 4 =$ $72 × 5 =$
$110 × 8 =$ $360 ÷ 6 =$ $21 × 30 =$
$560 ÷ 7 =$ $332 - 130 =$ $389 - 280 =$
$128 ÷ 2 =$ $203 × 4 =$ $480 ÷ 5 =$
$13 × 40 =$ $220 ÷ 2 =$ $31 × 50 =$
$250 + 360 =$ $245 × 2 =$ $348 ÷ 3 =$
$140 × 2 =$ $216 ÷ 9 =$ $37 × 20 =$

一、18 38 120
166 104 21
42 53 128
118 15 360
880 60 630
80 202 109
64 812 96
520 110 1550
610 490 116
280 24 740

二、先写出涂色部分表示的分数，再写出小数。

二、4 0.4
7 0.7
3 0.3