一、口算。
13 - 6 =
2 + 9 =
85 - 40 - 5 =
68 + 7 =
89 - 50 =
65 + 9 - 60 =
62 - 7 =
40 + 37 =
98 - 80 + 5 =
6 + 68 =
17 - 8 =
18 + 9 + 8 =
97 - 30 =
51 + 9 =
80 - 50 + 26 =
72 + 10 =
90 - 6 =
58 + 5 - 20 =
80 - 50 =
60 + 20 =
18 + 40 + 6 =
34 + 9 =
61 - 8 =
72 - 8 + 20 =
43 - 8 =
28 + 8 =
56 + 4 + 17 =
57 + 6 =
75 - 60 =
96 - 70 + 4 =

一、7 11 40 75 39 14 55 77 23 74 9 35 67 60 56 82 84 43 30 80 64 43 53 84 35 36 77 63 15 30

二、在得数是六十多的算式后面画“√”。
45 + 20 □
45 + 2 □
72 - 30 □
72 - 3 □
96 - 30 □
78 - 9 □
85 - 30 □
58 + 9 □
76 - 5 □

二、