二、解决问题
★单元练习7
建议用时:6分钟
实际用时:分钟
340-120 =
2000-400 =
700-230 =
450-320 =
242+267 =
3×6 =
8×7 =
81÷9 =
3×7 =
42÷8 =
56÷8 =
50÷7 =
71÷8 =
23÷4 =
37+46 =
380+140 =
640+60 =
700+40 =
210+90 =
29+37 =
390-140 =
930+40 =
220+700 =
650-260 =
460+300 =
2270+109 =
720-517 =
766-66 =
360+40 =
570+320 =
400+240 =
1000-800 =
1000-600 =
360+40 =
820-300 =
330+60 =
900-400 =
36+42+18 =
210-30 =
9000-8000 =
569-314 =
976-45 =
420+50 =
16÷8 =
245+50 =

340-120 = 220
2000-400 = 1600
700-230 = 470
450-320 = 130
242+267 = 509
3×6 = 18
8×7 = 56
81÷9 = 9
3×7 = 21
42÷8 = 5……2
56÷8 = 7
50÷7 = 7……1
71÷8 = 8……7
23÷4 = 5……3
37+46 = 83
380+140 = 520
640+60 = 700
700+40 = 740
210+90 = 300
29+37 = 66
390-140 = 250
930+40 = 970
220+700 = 920
650-260 = 390
460+300 = 760
2270+109 = 2379
720-517 = 203
766-66 = 700
360+40 = 400
570+320 = 890
400+240 = 640
1000-800 = 200
1000-600 = 400
360+40 = 400
820-300 = 520
330+60 = 390
900-400 = 500
36+42+18 = 96
210-30 = 180
9000-8000 = 1000
569-314 = 255
976-45 = 931
420+50 = 470
16÷8 = 2
245+50 = 295

拓展园地
乐乐排队买冰激凌。从前往后数，他排第20；从后往前数，他排第7。那么这支队伍一共有多少人？

20 + 7 - 1 = 26（人）
答：这支队伍一共有26人。