First see what 4 could go by and the answer closest to 18 that is not more than the answer is the first number of the answer. 4×1=4 4×2=8 4×3=12 4×4=16 In this case 4 is the first number of the answer because if you fo 4 by 5 it equals 20 , which is more than the answer 4×5=20 after that , you subtract the answer, 18 minus 16 which is 2 because nothing times 4 equals 2 So the remainder is 2/4 or .50 If you have any questions about this please don't hesitate to ask me