三、观察物体（一）
★单元练习1
建议用时:6分钟
实际用时:分钟
2×6 =
14÷3 =
30÷7 =
19÷9 =
29÷7 =
3×7 =
71÷8 =
8×8 =
5×6 =
28÷4 =
42÷7 =
18÷2 =
17÷5 =
20÷3 =
32÷6 =
87-54 =
56+26 =
71+29 =
82-17 =
55-28-2 =
8+48 =
49+5 =
76-8 =
44-15 =
40+22 =
32+51 =
98-27 =
77-33 =
65+27 =
36+46 =
230+270 =
580+340 =
510-100 =
630-230 =
103-50 =
51-34 =
63-59 =
120+350 =
63+300 =
540-230 =
650+60 =
40+309 =
490+370 =
450-450 =
710-380 =

2×6 = 12
14÷3 = 4……2
30÷7 = 4……2
19÷9 = 2……1
29÷7 = 4……1
3×7 = 21
71÷8 = 8……7
8×8 = 64
5×6 = 30
28÷4 = 7
42÷7 = 6
18÷2 = 9
17÷5 = 3……2
20÷3 = 6……2
32÷6 = 5……2
87-54 = 33
56+26 = 82
71+29 = 100
82-17 = 65
55-28-2 = 25
8+48 = 56
49+5 = 54
76-8 = 68
44-15 = 29
40+22 = 62
32+51 = 83
98-27 = 71
77-33 = 44
65+27 = 92
36+46 = 82
230+270 = 500
580+340 = 920
510-100 = 410
630-230 = 400
103-50 = 53
51-34 = 17
63-59 = 4
120+350 = 470
63+300 = 363
540-230 = 310
650+60 = 710
40+309 = 349
490+370 = 860
450-450 = 0
710-380 = 330

拓展园地
在里填上合适的数，使每条线上的3个数相加之和都等于100。那么“△”和“☆”各代表多少呢？

△代表60，☆代表0