一、口算。
$12÷ 2=$
$6÷ 6=$
$20÷ 4=$
$16÷ 4=$
$4× 2=$
$4÷ 2=$
$5× 5=$
$2× 5=$
$6× 6=$
$30÷ 5=$
$8÷ 4=$
$12÷ 4=$
$2× 2=$
$6÷ 3=$
$3× 5=$
$18÷ 6=$
$15÷ 5=$
$9÷ 3=$
$5× 6=$
$6× 2=$
$4÷ 4=$
$3÷ 3=$
$20÷ 5=$
$4× 3=$
$6÷ 2=$
$3× 3=$
$36÷ 6=$
$4× 6=$
$6÷ 1=$
$15÷ 3=$

1.6
2.1
3.5
4.4
5.8
6.2
7.25
8.10
9.36
10.6
11.2
12.3
13.4
14.2
15.15
16.3
17.3
18.3
19.30
20.12
21.1
22.1
23.4
24.12
25.3
26.9
27.6
28.24
29.6
30.5

二、在（）里填合适的数。
$6×( )=36$
$5×( )=15$
$15÷( )=3$
$3×( )=9$
$4×( )=20$
$8÷( )=4$
$10÷( )=2$
$20÷( )=4$
$16÷( )=4$
$5×( )=25$
$12÷( )=3$
$24÷( )=6$
$18÷( )=3$
$2×( )=8$
$12÷( )=2$

1.6
2.3
3.5
4.3
5.5
6.2
7.5
8.5
9.4
10.5
11.4
12.4
13.6
14.4
15.6