4.2 / 0.2
For division of decimals shift the decimal point so many places to the right in both numbers, so that the denomnator is a whole number.
Hence
4.2 / 0.2 - 42.0/2
Divide 42 by '2' answer is '21' !!!!
7
0.0417
42 divided into 126 = 0.3333333333333333
620 divided 42 = 14.761904761904763
3 divided by 42 is 0.071428571428
3.5
0.4375
42
42
26
84 divided by 2 is 42
4.2857