一、口算。
$60 - 24 =$
$84 ÷ 4 =$
$19 × 3 =$
$0 ÷ 87 =$
$55 × 4 =$
$75 ÷ 5 =$
$65 ÷ 5 =$
$24 × 6 =$
$68 ÷ 4 =$
$97 - 75 =$
$56 ÷ 2 =$
$81 × 4 =$
$350 ÷ 7 =$
$21 × 50 =$
$130 × 2 =$
$128 + 22 =$
$630 ÷ 3 =$
$302 × 4 =$
$328 ÷ 4 =$
$26 × 20 =$
$70 × 21 =$
$182 × 3 =$
$549 ÷ 9 =$
$93 × 20 =$
$13 × 70 =$
$250 × 2 =$
$126 ÷ 2 =$
$520 + 382 =$
$614 ÷ 2 =$
$42 × 80 =$

一、36 21 57
0 220 15
13 144 17
22 28 324
50 1050 260
150 210 1208
82 520 1470
546 61 1860
910 500 63
902 307 3360

二、先用分数表示涂色部分，再分别写出它们的分数单位和含有分数单位的个数。

分数() () ()
分数单位() () ()
分数单位个数() () ()

二、$\dfrac{4}{5}$ $\dfrac{1}{5}$ 4
$\dfrac{6}{10}$ $\dfrac{1}{10}$ 6
$\dfrac{2}{4}$ $\dfrac{1}{4}$ 2