Most of the time, he has no trouble ______________ the people from different countries.
56+37﹣80+16=
31.5+5=
12﹣1.1=
1.2×0.2=
2.87÷0.7=
1÷ 45 =
16 +56 =
715−115 =
415÷25 =
38×45 =
30÷50=
0× 78 =
25×8=
14+15 =
12×23 =