16-8= 13-6= 11-7= 16-5=
5+9= 67-7= 31+6= 30+28=
2+86= 43-30= 52+20= 67-9=
( )
15-6= 13-5= 54-4= 11-7+6=
17-8= 11-6= 70-10= 14-9-2=
14-6= 75+4= 30+24= 20+30+40=
12-5= 18-9= 37+2= 40+60-70=
14-6= 76-70= 6+20= 40+9= 25-5+7=
5+30= 15-9= 2+50= 30+4= 32-2+8=
58-8= 4+20= 7+30= 59-50= 50+5-5=
67-7= 80+8= 11-7= 74-4+3= 40+6+1=
67+9=
70-5=
25+70=
53-18=
40+58=
80-70=
23+4=
83-80=
13-7= 12-5= 11-4= 25+70-80=
14-9= 28-5= 44+5= 32-2+58=
27-5= 63-50= 89-6= 90-50+42=
90-40= 48+20= 6+63= 40+20+6=
13-6= 86-60= 39-20= 54+3-5=
个十和个一是
5+=11 12-<8 15-=-6
-6=8 -4>7 13-=+
=976-(148+52)
=976-200
=776 ( )改正:
=376-176+59
=200+59
=259 ( )改正:
328+199= 2.4+3.06= 24×12.5%= 4﹣﹣=
﹣= 3.2÷0.01= 3.5:1.4=﹣=
70分=小时。