小开云kaiyun(中国)二年级数开云kaiyun(中国)下册练习题:口算练习1
11-4= 34+40= 43+5= 30+30+7=
40+20= 10+90= 12-6= 41-10+60=
52-10= 13-8= 17+35= 52+9-30=
65+5= 20+78= 89-8= 20+58+2=
90-30= 14-6= 15-8= 21-20+4=
18-9= 7+7= 11+9= 14-5=
40+30= 43-3= 80-60= 70+3=
12-7= 30+8= 13-9= 50-10=
90-40= 60+10= 56-6= 90+0=
79-4= 50+30= 90-70= 54+4=
11-4= 34+40= 43+5= 30+30+7=
40+20= 10+90= 12-6= 41-10+60=
52-10= 13-8= 17+35= 52+9-30=
65+5= 20+78= 89-8= 20+58+2=
90-30= 14-6= 15-8= 21-20+4=
18-9= 7+7= 11+9= 14-5=
40+30= 43-3= 80-60= 70+3=
12-7= 30+8= 13-9= 50-10=
90-40= 60+10= 56-6= 90+0=
79-4= 50+30= 90-70= 54+4=