Multiple choice general knowledge math & puzzles 0.7 x 0.6 0.419 0.52 4.2 0.42 Reveal answer Fill a bubble to check yourself D Correct answer Explanation When multiplying decimals, multiply the numbers as integers (7 * 6 = 42) and then place the decimal point so the result has the same number of decimal places as the sum of the decimal places in the factors (1 + 1 = 2). Thus, 0.42.