四、在〇里填“>”“<”或“=”。(共 12 分)
25 × 64 〇 63 × 25 61 × 17 〇 60 × 17 + 60 70 × 19 〇 78 × 20 - 1
5 × 5 × 14 〇 14 × 2 × 13 90 × 36 〇 30 × 96 28 × 60 〇 280 × 6
25 × 64 〇 63 × 25 61 × 17 〇 60 × 17 + 60 70 × 19 〇 78 × 20 - 1
5 × 5 × 14 〇 14 × 2 × 13 90 × 36 〇 30 × 96 28 × 60 〇 280 × 6
答案
四 > < <
< > =
< > =
五、求角的度数。(共 2 分)

∠1 + ∠2 + ∠3 = 180°
∠4 + ∠5 + ∠6 = (
∠1 + ∠2 + ∠3 = 180°
∠4 + ∠5 + ∠6 = (
360
)°答案
五 360
六、看图列式计算。(共 6 分)
1.

2.

1.
2.
答案
六 1. 36 + 26 + 36 = 98(个)
2. 44 + 44 × 3 = 176(只)
[或 44 × (1 + 3) = 176(只)]
2. 44 + 44 × 3 = 176(只)
[或 44 × (1 + 3) = 176(只)]
七、照样子填一填,算一算。(共 10 分)
1. 46 × 31 = 46 × 30 + 46 = 1426
85 × 61 = 85 × 60 + (
76 × 51 = 76 × (
2. 34 × 29 = 34 × 30 - 34 = 986
56 × 19 = 56 × 20 - (
68 × 49 = 68 × (
1. 46 × 31 = 46 × 30 + 46 = 1426
85 × 61 = 85 × 60 + (
85
) = (5185
)76 × 51 = 76 × (
50
) + (76
) = (3876
)2. 34 × 29 = 34 × 30 - 34 = 986
56 × 19 = 56 × 20 - (
56
) = (1064
)68 × 49 = 68 × (
50
) - (68
) = (3332
)答案
七 1. 85 5185 50 76
3876
2. 56 1064 50 68
3332
3876
2. 56 1064 50 68
3332
简便计算:1000 - 81 - 19 - 82 - 18 - 83 - 17 - 84 - 16 - 85 - 15。
答案
思维提升
原式 = 1000 - (81 + 19) - (82 + 18) - (83 + 17) - (84 + 16) - (85 + 15)
= 1000 - 100 - 100 - 100 - 100 - 100
= 500
原式 = 1000 - (81 + 19) - (82 + 18) - (83 + 17) - (84 + 16) - (85 + 15)
= 1000 - 100 - 100 - 100 - 100 - 100
= 500
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