一、口算。
60 + 12 =
12 ÷ 4 =
5 × 3 + 35 =
2 × 8 =
40 - 14 =
4 × 4 ÷ 8 =
72 - 39 =
4 × 6 =
24 ÷ 4 ÷ 3 =
56 ÷ 7 =
29 + 25 =
55 - 18 - 30 =
81 - 48 =
9 × 7 =
6 × 6 - 27 =
40 ÷ 5 =
49 ÷ 7 =
48 ÷ 6 ÷ 4 =
9 ÷ 3 =
7 × 2 =
7 × 5 + 45 =
5 × 9 =
27 ÷ 9 =
36 + 28 - 50 =
60 - 47 =
6 ÷ 3 =
20 ÷ 5 × 9 =
21 ÷ 3 =
28 ÷ 4 =
27 + 30 + 23 =

1.72
2.3
3.50
4.16
5.26
6.2
7.33
8.24
9.2
10.8
11.54
12.7
13.33
14.63
15.9
16.8
17.7
18.2
19.3
20.14
21.80
22.45
23.3
24.14
25.13
26.2
27.36
28.7
29.7
30.80

二、填一填。
26 $\xrightarrow{-10}$ □ $\xrightarrow{÷4}$ □ $\xrightarrow{×8}$ □
8 $\xrightarrow{×6}$ □ $\xrightarrow{+35}$ □ $\xrightarrow{-29}$ □
54 $\xrightarrow{÷9}$ □ $\xrightarrow{$$}$ □ $\xrightarrow{+40}$ □
91 $\xrightarrow{-64}$ □ $\xrightarrow{+18}$ □ $\xrightarrow{÷5}$ □

1.16 4 32
2.48 83 54
3.6 42 82
4.27 45 9