0.13×100=
7×(68+22)=
5×4÷5×4=
3.26-1.61=
920÷20=
398×51≈
9.2-3.2+6.8-9.2=
+=( )
+=
-=
1-=
51×7≈
49×6≈
299+103≈
701−198≈
24×2=
240+550=
904-201=
2×900=
103×5=
196×4≈
20×5-100=
72÷(107-98)=