口算.70+8= 45-40= 20+60= 16-8=
62-6= 38+8= 73-30= 18+5=
40+50= 96-20= 38-9= 92-20=
17-8= 30+54= 43-10= 27+7=
52+9= 94-40= 68+20= 13-6=
12-8= 36+60= 54-40= 75+9=
27+30= 86-60= 48+5= 93-9=
98-80= 34+4= 52-6= 45+50=
69+10= 87-80= 50+30= 14-8=
90-60= 39+9= 72-8= 47+30=
24+8= 11-5= 35+30= 62-4=
15-6= 28+40= 89-40= 77+6=
48+50= 16-9= 39+4= 56-20=
43-8= 89+8= 12-7= 17+30=
26+60= 14-5= 43+50= 32-3=
70-10= 36+40= 11-8= 78+7=
90+6= 58-50= 81+9= 64-4=
12-3= 19+6= 37-20= 65+30=
88+8= 83-30= 46+4= 65-30=
54-4= 24+60= 13-9= 76+9=
