Question

In a library, there are $1,250$ comic books, and the price of $1$ comic book is $\$16$. Find the total price (in $\$$) of the comic books available in the library.

• A. 20000

Answer 1

The correct option is A 20000
Number of comic books available in the library $=1,250$

Price of $1$ comic book $=\$16$

$\therefore$ Total price of the comic books available in the library $=\$(16\times 1,250)$

To find out the value of $16\times 1,250$, we follow the below steps:

$\bullet$ First we write the bigger number at the top and smaller number just below of it with a proper alignment of one's place.


$\bullet$ We first multiply $6$ with $0$, which is $0$. The next number, we get $6\times 5=\underset{–}{3}0$, where $3$ is carrying over to the next multiplication, $6\times 2$. Hence, the next number would be $(6\times 2)+3=12+3=\underset{–}{1}5$, where $1$ is carrying over to the next multiplication, $6\times 1$. So, finally the last number, we get $(6\times 1)+1=6+1=7$.


$\bullet$ For the next multiplication step, we leave one's place (denoted by faded $0$), and start from ten's place.
We first multiply $1$ with $0$, which is $0$. The next number, we get $1\times 5=5$. The next number would be $1\times 2=2$. Finally the last number, we get $1\times 1=1$.


$\bullet$ Next, we add $7500$ and $12500$ to get the final result. Here, $‘‘1+"$ denotes the carry over in addition.



$\therefore 1,250\times 16=20,000$

Hence, the total price of the comic books available in the library is $\$20,000$.