Question

help please solve the examples

Answer 1

1)300*2=600
2)230*3=690
3)170*5=850
4)4*180=720
5)390*2=780
6)240*3=720
7)720-150*4=120
8)120*4+400=880
9)70*9-20=610

Answer 2

300•2=600
230•3=690
170•5=850
4•180=720
390•2=780
240•3=720
720-150•4=120
120•4+400=880
70•9-20=610