一、口算。
40 + 50 = 81 - 4 = 3 + 9 =
63 - 60 = 36 + 9 = 51 - 50 =
35 + 8 = 17 - 8 = 67 + 7 =
53 - 8 = 23 + 9 = 75 - 70 =
34 + 40 = 64 - 20 = 85 - 20 =
92 - 7 = 55 + 8 = 48 + 8 =
34 - 20 = 72 - 3 = 20 + 15 =
11 + 60 = 43 + 7 = 45 - 6 =
64 - 5 = 86 - 70 = 30 + 28 =
40 + 30 = 5 + 27 = 71 - 40 =

一、90 77 12
3 45 1
43 9 74
45 32 5
74 44 65
85 63 56
14 69 35
71 50 39
59 16 58
70 32 31

二、在 ○ 里填“＞”“＜”或“=”。
35 + 8 ○ 42 44 + 6 ○ 50 + 6 53 + 9 ○ 7 + 55
46 - 8 ○ 37 63 - 7 ○ 54 - 8 39 + 5 ○ 50 - 6
94 - 50 ○ 44 54 + 5 ○ 39 + 20 50 - 8 ○ 36 + 5

二、＞ ＜ =
＞ ＞ =
= = ＞