内容正文:
单元 2 第 1 课时 观察物体(教材 P13)
4 年级 下 R
69 - 46 = 11 × 50 = 400 ÷ 8 = 40 × 50 =
78 - 29 = 480 ÷ 4 = 130 × 5 = 810 ÷ 9 =
900 ÷ 3 = 630 ÷ 3 = 36 ÷ 6 = 123 ÷ 3 =
75 × 20 = 25 × 40 = 98 × 0 = 0 ÷ 413 =
650 - 340 = 560 ÷ 40 = 134 + 209 = 80 × 40 =
720 ÷ 60 = 480 ÷ 12 = 53 × 20 = 18 × 3 =
640 - 280 = 75 + 125 = 204 × 8 = 650 - 140 =
108 + 68 = 750 ÷ 50 = 18 × 40 = 640 ÷ 40 =
540 ÷ 90 = 740 + 180 = 488 ÷ 8 = 708 - 508 =
125 + (39 - 25) × 16 288 ÷ [(48 + 24) ÷ 8] 12 × [49 ÷ (51 - 44)]
12 × (136 - 78) ÷ 29 [149 - (45 + 66)] × 12 400 ÷ (10 + 15 × 2)
01
单元 2 第 2 课时 练习课(教材 P15)
4 年级 下 R
104 × 3 = 120 ÷ 6 = 800 ÷ 40 = 520 ÷ 13 =
400 × 50 = 3 × 304 = 721 ÷ 7 = 102 ÷ 3 =
50 × 80 = 420 - 180 = 82 × 5 = 75 ÷ 5 =
75 + 25 = 108 - 72 = 80 × 30 = 135 × 2 =
250 × 4 = 960 ÷ 30 = 4800 ÷ 60 = 990 ÷ 30 =
0 × 175 = 120 ÷ 30 = 147 - 147 = 32 × 50 =
90 ÷ 5 = 240 ÷ 12 = 123 + 77 = 420 ÷ 6 =
200 ÷ 25 = 840 ÷ 70 = 45 + 65 = 406 - 357 =
504 × 7 = 140 + 273 = 85 ÷ 5 = 186 ÷ 6 =
45 × (22 ÷ 2) ÷ 5 240 ÷ [(4 + 6) × 2] (250 - 25) × (10 + 18)
640 ÷ [(35 + 45) × 2] (500 - 58) ÷ 26 + 23 25 × [(180 + 492) ÷ 32]
11
单元 2 第 2 单元计算易错专练
4 年级 下 R
1. 直接写出得数。
80 × 30 = 150 ÷ 3 = 90 ÷ 5 = 78 - 49 =
420 ÷ 70 = 12 × 50 = 560 ÷ 40 = 91 + 42 =
96 - 29 = 480 ÷ 6 = 84 ÷ 4 = 33 × 20 =
408 ÷ 8 = 0 × 125 = 810 ÷ 9 = 732 - 0 =
4 × 103 = 63 ÷ 3 = 48 + 64 = 155 + 345 =
440 - 280 = 3 × 140 = 68 + 232 = 201 + 19 =
75 × 20 = 490 ÷ 7 = 125 + 75 = 250 ÷ 50 =
816 ÷ 4 = 72 ÷ 6 = 140 + 280 = 750 ÷ 15 =
420 ÷ 6 = 57 × 20 = 840 - 180 = 360 ÷ 60 =
2. 脱式计算。
720 ÷ 36 + 29 × 3 12 × (34 + 46) ÷ 32 15 × [(48 + 16) ÷ 32]
(200 - 16 × 8) ÷ 18 480 ÷ [4 × (50 - 40)] 216 ÷ [(6 + 2) × 3]
21
4年级下R
参考答案
口快了
结束时间
时
分-开始时间
时
分=做题时间」
《⑨比上次日慢7
分
参考答案
第1页
脱式计算提升
口算能力提升
6145250
524013
44544744
61608318
第7页
9279546
1008050090
口算能力提升
81135439
17474241
855920450