一、口算。
$80 - 22 =$
$64 ÷ 4 =$
$8 × 41 =$
$62 × 5 =$
$73 + 27 =$
$72 ÷ 6 =$
$98 ÷ 7 =$
$200 × 6 =$
$140 + 160 =$
$80 × 30 =$
$609 ÷ 3 =$
$8 × 306 =$
$568 ÷ 8 =$
$180 × 6 =$
$510 - 290 =$
$34 × 20 =$
$808 ÷ 4 =$
$11 × 30 =$
$336 ÷ 6 =$
$19 × 50 =$
$459 ÷ 3 =$
$833 × 3 =$
$500 ÷ 2 =$
$53 × 30 =$
$212 ÷ 4 =$
$0 × 640 =$
$200 - 78 =$
$16 × 60 =$
$650 ÷ 5 =$
$26 × 80 =$

一、58 16 328
310 100 12
14 1200 300
2400 203 2448
71 1080 220
680 202 330
56 950 153
2499 250 1590
53 0 122
960 130 2080

二、在上面的$□$里填分数，在下面的$□$里填小数。

二、$\dfrac{4}{10}$ 0.6 $\dfrac{9}{10}$
1.5 2.3