60
60% can be thought of as 60/100. So to find 60% of 4200, use 60/100 x 4200. Hundreds cancel out, and you have 60 x 42. Therefore, the answer is 252.
100
4.2
140
It is: 4200/60 = 70 minutes
0.0286
4200.
70 x 60 = 4200
700
0.0198
It is: 70 times 60 = 4200