Question

100 people have been invited to a banquet. The caterer is arranging tables and each table can seat 12 people. How many tables are needed?

Answer 1

To answer this question, we need to divide 100 by 12

$$\begin{array}{c}8\\ 12100\\ -\underset{–}{96}2\\ 4\end{array}$$Thus, we have a quotient of 8 and a remainder of 4.
This means if 8 tables are arranged, 4 of the guests would not be able to sit. Thus we need one extra table.
=> Total number of tables needed = 8 + 1 = 9