Final answer:
To estimate the total number of raffle tickets sold, add the rounded numbers of tickets sold to teachers (600) and students (1500) together, totaling approximately 2100 tickets.
Step-by-step explanation:
The question asks for an estimate of the total number of raffle tickets sold to parents, teachers, and students for a school fundraiser. 563 tickets were sold to teachers, and there were 888 more tickets sold to students than to teachers. To find the total number of tickets and round to the nearest hundred, we first calculate the number of tickets sold to students, which is 563 + 888 = 1451. When rounded to the nearest hundred, tickets sold to teachers is approximately 600 and 1451 rounded is 1500. Assuming no tickets were sold to parents, or the number of tickets sold to parents is negligible and not provided, we add these two estimates: 600 (teachers) + 1500 (students) = 2100. Thus, the closest estimate to the total number of tickets sold is about 2100.