①=
②=
③=
④=
⑤=
⑥=
⑦59×41≈
⑧632÷69≈
7.5×100=
1.3+2.4=
25×40=
630÷90=
4.8×=
÷14=
25+85= 73.9-39.6= = =
18÷6= 798+205≈ 632÷69≈ 803-207≈
=×
=
=20÷
=20×
15+8= ﹣0.3= 13×0.6= 2.8÷0.7=
×= ÷2= += 52=
10-3.8= 2.8+8.2= 1.2÷0.4= 0.88×10= 1.25×11×8=
+ = × = 53= ÷4= 120×( - )=