一、口算。
61 - 5 =
53 + 20 =
76 - 50 =
72 + 6 =
96 - 7 =
50 - 6 =
60 - 6 =
58 + 2 =
63 + 30 =
3 + 39 =
67 - 30 =
45 + 9 =
61 - 40 =
61 + 9 =
86 + 7 =
18 + 60 =
26 - 9 =
21 - 4 =
51 - 30 =
85 + 6 =
70 - 30 =
34 + 7 =
54 - 50 =
54 + 40 =
97 - 5 =
43 + 50 =
64 - 5 =
16 + 8 =
82 - 7 =
30 + 19 =

一、56 73 26
78 89 44
54 60 93
42 37 54
21 70 93
78 17 17
21 91 40
41 4 94
92 93 59
24 75 49

二、在$□$里填合适的数。
4 + $□$ = 24
$□$ - 6 = 50
14 - $□$ = 65 - 60
$□$ + 8 = 63
5 + $□$ = 39
41 - $□$ = 62 - 30
$□$ - 6 = 44
$□$ - 30 = 51
47 + 8 = $□$ - 7

二、20 56 9
55 34 9
50 81 62