There are 23 classes in the fourth grade. each grade has 21 students. write a number sentence that will provide a reasonable estimate for the number of students in the fourth grade. explain how you found your estimate.

23 can round to 20 and 21 can also round to 20 so all u do is 20x20=400 so 400 is your estimated answer

The question is kind of confusing. if it's asking how many variations of answers can you give. then do 4^5 for your answer.this would be something like the first question could be a and the 2nd c or first b next c etc. if you can, ask the teacher for a better confirmation of what it's asking. if i'm assuming correctly what it's asking, it's 625 different variations.