13-7=
24-6=
44+9=
40+34-9=
25-7=
18+22=
36-10=
34-20+6=
71+8=
63-50=
80-30=
72-70+8=
20+70=
37-8=
62-2=
45+9=
18-9=
5+70=
100-60=
11-7=
65-5=
38-15=
99-80=
13+30=
48-26=
46+33=
30+61=
87-14=
13-7= 40+18= 17-9= 31+6=
6+52= 81-20= 23+56= 30+70=
480÷60= 3.72+6.28= +×1=
235+99= ﹣= 12×÷12×=
1.2×2= 20×33%= 31×299≈
0.4÷8= + = 631÷9≈
﹣ = + = 0.25+ = ﹣ = 4×2.5=
0×98.56= 45×11= 0.85﹣15%= 0.65×101﹣0.65=
×10÷ ×10=