Multiple choice general knowledge Divide 30 by half and add ten what do u get? 25 20 70 10 Reveal answer Fill a bubble to check yourself C Correct answer Explanation Divide 30 by half means 30 divided by 1/2, which is 30 multiplied by 2, giving 60. Adding 10 gives 70. A common mistake is interpreting 'divide by half' as 'divide by 2' which would give 15, then adding 10 to get 25.