三、观察物体（一）
★单元练习2
建议用时:6 分钟
实际用时:分钟
80+60 =
25-8 =
8×6 =
39÷5 =
60+20 =
27÷7 =
23÷4 =
39+8 =
41-18 =
56÷7 =
624-414 =
330+120 =
834-624 =
6×4 =
17+7 =
21÷8 =
81÷9 =
65÷8 =
47÷5 =
40÷6 =
9×7 =
6×6 =
67÷8 =
66+29 =
65-50 =
129+321 =
70+240 =
605+164 =
8023+900 =
305+146 =
35÷5 =
56÷8 =
89÷9 =
40÷5 =
100-60 =
250+500 =
700-300 =
8600-600 =
1200-700 =
8500-3000 =
500+387 =
3000+5000 =
441+700 =
600-587 =
240+70 =

80+60 = 140
25-8 = 17
8×6 = 48
39÷5 = 7……4
60+20 = 80
27÷7 = 3……6
23÷4 = 5……3
39+8 = 47
41-18 = 23
56÷7 = 8
624-414 = 210
330+120 = 450
834-624 = 210
6×4 = 24
17+7 = 24
21÷8 = 2……5
81÷9 = 9
65÷8 = 8……1
47÷5 = 9……2
40÷6 = 6……4
9×7 = 63
6×6 = 36
67÷8 = 8……3
66+29 = 95
65-50 = 15
129+321 = 450
70+240 = 310
605+164 = 769
8023+900 = 8923
305+146 = 451
35÷5 = 7
56÷8 = 7
89÷9 = 9……8
40÷5 = 8
100-60 = 40
250+500 = 750
700-300 = 400
8600-600 = 8000
1200-700 = 500
8500-3000 = 5500
500+387 = 887
3000+5000 = 8000
441+700 = 1141
600-587 = 13
240+70 = 310

拓展园地
要计算下图中围棋棋子的数量,下列哪个算式是不正确的? ()


A.$4×4=16$
B.$4×5=20$
C.$4+4+4+4=16$
D.$1+2+3+4+3+2+1=16$

B