4. Mr Preston has 2 math classes Class
   one has 27 students and class two
   has 26 students If each student
   answered 18 test questions, how many
   questions does Mr. Preston have to
   grade in all?

To find out how many questions Mr. Preston has to grade in total, we first need to calculate the total number of students. Class one has 27 students and class two has 26 students, giving us 27 + 26 = 53 students. If each student answered 18 test questions, we then multiply the total number of students by the number of questions each answered. So, 53 students × 18 questions = 954 questions in total. Therefore, Mr. Preston has to grade 954 test questions!

Remember to double-check your multiplication and addition! A common mistake is forgetting to add all the students together or miscalculating the number of questions per student. Keeping your calculations organized can help minimize these errors!