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一、口算。
43 + 20 =
45 - 20 =
10 + 87 - 7 =
98 - 40 =
67 - 40 =
72 - 60 - 5 =
87 - 40 =
30 + 50 =
60 + 26 - 80 =
20 + 75 =
97 - 20 =
87 - 70 - 9 =
68 - 30 =
45 + 50 =
98 - 80 + 30 =
58 + 30 =
47 - 40 =
38 + 20 - 50 =
78 - 70 =
80 - 30 =
89 - 60 - 9 =
22 + 20 =
86 + 10 =
53 - 30 - 10 =
65 - 50 =
82 - 20 =
65 - 40 + 50 =
77 - 50 =
30 + 66 =
57 + 30 - 60 =
答案
一、63 25 90
58 27 7
47 80 6
95 77 8
27 96 27
58 27 7
47 80 6
95 77 8
27 96 27
二、在□里填合适的数。
41 + □ = 71
□ - 20 = 64
84 + □ = 94
□ - 20 = 77
67 - □ = 7
□ - 30 = 50
□ + 40 = 88
□ - 50 = 45
79 - □ = 9
41 + □ = 71
□ - 20 = 64
84 + □ = 94
□ - 20 = 77
67 - □ = 7
□ - 30 = 50
□ + 40 = 88
□ - 50 = 45
79 - □ = 9
答案
二、30 84 10
97 60 80
48 95 70
97 60 80
48 95 70
