The answer is 40
It is 42, exactly as in the question.
42 rounds down to 40.
It is: 42 rounded to the nearest whole number
42
42
42.
42
40
It depends how round you want it.-- To the nearest 1/10th or to the nearest unit: 42-- To the nearest 10: 40-- To the nearest 100: Zero
42.0
42