4.2 is rounded to 4. If the decimal is .5 or greater than you round up. If it is below .5 then you round down.
An example is 4.5 would be rounded to 5. So would 4.6, 4.67, 4.6789, 4.51
Furthermore, 4.4, 4.3, 4.2, 4.1 is rounded to 4.
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42.0
7.05 / 42 = 1 / 5.957 (rounded)
40
40,000,000
The square root of 42 is substantially less than 500, so rounded to the nearest thousand it is 0.