30*2=60
2*30= 60
60:2 = 30
60:30= 2
200*3 = 600
3*200 = 600
600: 3 =200
600: 200= 3
50*2 = 100
2*50 = 100
100:2 =50
100: 50= 2
500*2 = 1000
2* 500 = 1000
1000:2 = 500
1000: 500 = 2
