Question

Find the amount required for pencils to complete all the notebooks.

• A. $90
• B. $45
• C. $30
• D. $75

Answer 1

The correct option is D $75

$\text{Number of notebooks in the table}=15$
$\text{Price of 1 pencil}=\$1$
Number of pencils required to complete 1 notebook = 5

$\text{∴ Total price of all the pencils}=\$1\times 5\times 15$
$=(\$1\times 5)\times 15$

From the multiplication table, we see:


$\text{∴ Total price of all the pencils}=\$5\times 15$

$\text{Expanded form of}5\times 15\text{is:}$


Step 1: Draw a table with numbers written on top as:


Step 2: Fill the table by multiplying the numbers:


Step 3: At last, add all the products obtained:


So, the amount required for pencils to complete all the notebooks is $75.