Multiple choice general knowledge math & puzzles If you divide 30 by 1/2 and then add 10 what do you have? 25 35 70 90 Reveal answer Fill a bubble to check yourself C Correct answer Explanation Dividing by 1/2 is the same as multiplying by 2. So, 30 / 0.5 = 60. Adding 10 to 60 results in 70. Distractors like 25 result from incorrectly multiplying by 1/2 or subtracting.