Question

Mike wants to arrange $108$ books on the shelves. If he keeps $9$ books on one shelf, how many such shelves does he need?

• A. $12$ shelves
• B. $13$ shelves
• C. $14$ shelves
• D. $11$ shelves

Answer 1

The correct option is A $12$ shelves

Let’s assume, to arrange 108 books Mike needs $“a”$ number of shelves.
To calculate the number of shelves required, we use the following division equation.
$a=108÷9$
$a=$ Total number of books $÷$ Number of books on a shelf
$=108÷9$
Let’s use the area model method for this division by splitting the number $108$ as $90+18.$

$a=108÷9=12$
Therefore, Mike needs $12$ shelves.

Hence, option B is correct.