The conference planner created 311 binders in total by adding 280 binders for attendees to 31 binders for presenters.
The conference planner has compiled a total number of binders by adding together the binders for attendees and presenters. With 280 binders for attendees and another 31 for presenters, the calculation to find the total is simply the sum of these two quantities. Therefore, the answer is obtained by adding 280 + 31, which equals 311.
The explanation in fewer than 150 words: To solve this problem, one needs to perform a basic arithmetic operation, which is addition. The conference planner prepared binders separately for two groups, and to find the overall total, we combine the quantities for each group. This is a straightforward calculation that does not require complex mathematical procedures.
So, when combining the amounts for two distinct groups, you should add the numbers representing each group to find the aggregate number.