二、解决问题
★单元练习1
建议用时:6分钟
实际用时:分钟
28+26 =
82-7 =
65-26 =
25-16 =
96-39 =
200+800 =
130-50 =
500+800 =
670-400 =
56-9 =
70+140 =
180-40 =
70-19 =
27+46 =
78+14 =
45-18 =
25+37 =
56-40 =
300-60 =
50+306 =
60+150 =
18+36 =
270-90 =
300-40 =
930-200 =
250+90 =
60-5 =
90-27 =
29+16 =
53+47 =
700-200 =
750-240 =
0+600 =
510-420 =
10+500 =
890-370 =
100+260 =
1000-500 =
250-200 =
220+600 =
650+90 =
740-60 =
300-80 =
120+50 =
520+90 =

28+26 = 54
82-7 = 75
65-26 = 39
25-16 = 9
96-39 = 57
200+800 = 1000
130-50 = 80
500+800 = 1300
670-400 = 270
56-9 = 47
70+140 = 210
180-40 = 140
70-19 = 51
27+46 = 73
78+14 = 92
45-18 = 27
25+37 = 62
56-40 = 16
300-60 = 240
50+306 = 356
60+150 = 210
18+36 = 54
270-90 = 180
300-40 = 260
930-200 = 730
250+90 = 340
60-5 = 55
90-27 = 63
29+16 = 45
53+47 = 100
700-200 = 500
750-240 = 510
0+600 = 600
510-420 = 90
10+500 = 510
890-370 = 520
100+260 = 360
1000-500 = 500
250-200 = 50
220+600 = 820
650+90 = 740
740-60 = 680
300-80 = 220
120+50 = 170
520+90 = 610

下图中包含“☆”的正方形共有几个？

1+4+3=8（个）
答：包含“☆”的正方形共有8个。