How many questions can you get wrong to get an 80 percent if there are 35 questions?

Answer 1

80% is simply 8/10 or .8. So multiply 35 by .2 and you get your answer, 7. To get an 80% on a 35 question exam you will have answered 28 questions correct and 7 incorrect. Percentages tend to confuse people but they don't have to. If you think of 100% as nothing more than 1 than you are well on your way to mastering %'s and fractions too. Let's look at your original question. You want to know how many questions you can miss out of 35 and still receive an 80%. First thing to do is convert 80% to decimal form and you do that by simply moving the decimal 2 places to the left from where it currently is. Where is it you may ask? It is implied that if it is not shown then it is directly following the last number. So 80% would mean the decimal is directly following the zero or to show it written it would look like this 80.%. Okay move it two positions to the left and you drop the percent symbol to come up with a simple decimal form of this .80 or just .8. The first number to the right of the decimal is the tenths position right? Right! So as a fraction it is written as 8/10. Now your question asked how many you could get wrong. If you multiply 35 by .8 you will come up with how many you must get right. So to figure how many you may get wrong take 1 and subtract .8. Your answer is .2 and now simply multiply 35 by .2 to get the number you may get wrong and still receive an 80% on the exam.