一、口算。
20 + 45 =
67 - 10 =
78 - 9 + 2 =
60 - 7 =
6 + 35 =
60 + 4 - 6 =
30 + 27 =
93 - 7 =
70 - 10 + 18 =
41 - 2 =
7 + 76 =
58 + 8 + 20 =
8 + 36 =
35 - 8 =
9 + 83 - 7 =
59 - 40 =
63 + 30 =
17 - 9 + 44 =
44 - 9 =
54 - 7 =
51 + 9 + 30 =
84 - 8 =
3 + 94 =
73 - 6 - 7 =
9 + 37 =
82 - 4 =
70 + 20 - 8 =
46 - 20 =
23 + 40 =
52 - 8 - 20 =

65 57 71
53 41 58
57 86 78
39 83 86
44 27 85
19 93 52
35 47 90
76 97 60
46 78 82
26 63 24

二、在$◯$里填“＞”“＜”或“=”。
42$◯$45 - 30
53 - 4$◯$63 - 4
56 - 9$◯$59 - 6
78 - 6$◯$12
30 - 5$◯$40 - 5
38 + 7$◯$50 - 5
60$◯$62 - 7
27 - 4$◯$27 - 9
41 - 2$◯$41 - 20

45-30=15
42＞15
42＞45-30
53-4=49
63-4=59
53-4＜63-4
56-9=47
59-6=53
56-9＜59-6
78-6=72
78-6＞12
30-5=25
40-5=35
30-5＜40-5
38+7=45
50-5=45
38+7=50-5
62-7=55
60＞62-7
27-4=23
27-9=18
27-4＞27-9
41-2=39
41-20=21
41-2＞41-20