1. 算一算
63 - 2 =
78 - 5 =
50 + 12 =
63 - 20 =
78 - 9 =
43 - 30 =
54 - 3 =
33 - 3 =
25 + 9 =
54 - 30 =
33 - 7 =
63 + 8 =
78 - 5 =
47 - 3 =
30 - 5 =
78 - 50 =
47 - 8 =
23 + 40 =
65 - 4 =
36 - 2 =
8 + 69 =
65 - 40 =
36 - 7 =
35 + 2 =
99 - 9 =
65 - 4 =
99 - 90 =
65 - 6 =
86 - 6 =
52 - 2 =
86 - 60 =
52 - 5 =
46 - 3 =
64 - 3 =
46 - 30 =
64 - 7 =
76 - 4 =
21 - 1 =
76 - 40 =
21 - 6 =

61
73
62
43
69
13
51
30
34
24
26
71
73
44
25
28
39
63
61
34
77
25
29
37
90
61
9
59
80
50
26
47
43
61
16
57
72
20
36
15

2. 在○里填上“＞”“＜”或“=”
47 - 20 ○ 42
52 - 6 ○ 46
49 + 5 ○ 55
76 - 6 ○ 60
80 - 40 ○ 76
16 + 9 ○ 27
39 + 5 ○ 34

1.$47 - 20 = 27$，$27＜ 42$，所以$47 - 20＜ 42$；
2.$52 - 6 = 46$，所以$52 - 6 = 46$；
3.$49 + 5 = 54$，$54＜ 55$，所以$49 + 5＜ 55$；
4.$76 - 6 = 70$，$70＞ 60$，所以$76 - 6＞ 60$；
5.$80 - 40 = 40$，$40＜ 76$，所以$80 - 40＜ 76$；
6.$16 + 9 = 25$，$25＜ 27$，所以$16 + 9＜ 27$；
7.$39 + 5 = 44$，$44＞ 34$，所以$39 + 5＞ 34$。
答案依次为：$＜$；$=$；$＜$；$＞$；$＜$；$＜$；$＞$。