



 
Shelley, Barb answered 5 questions incorrectly and 16 questions correctly so there were 16 + 5 = 21 questions. (I am assuming that she answered all the questions.) Hence her score is 16 out of 21. You could give the proportion of the questions she answered correctly. That would be 16/21 = 0.7619. You could also report that as a percentage by multiplying by 100 to get 76.19%. I hope this helps,  


Math Central is supported by the University of Regina and The Pacific Institute for the Mathematical Sciences. 