Question

$\text{The value of}2\times 4\times 5\times 7\text{is}$ _____.

• A. 140
• B. 70
• C. 40
• D. 280

Answer 1

The correct option is D 280

2 x 4 x 5 x 7 can be written as:
(2 x 4) x (5 x 7)

$\text{Let us first find the value of}2\times 4.$

Using the multiplication table, we get:


$\therefore 2\times 4=8$

$\text{Let us now find the value of}5\times 7.$

Using the multiplication table, we get:


$\therefore 5\times 7=35$

Now, the expression can be written as:
$(2\times 4)\times (5\times 7)=8\times 35$

$\text{Let us find the answer of}8\times 35$
$\text{by box method.}$


$\text{The expanded form of}35\times 8\text{is:}$


Step 1: Let's draw a table and write the numbers.


Step 2: Fill the table by multiplying the numbers.


Step 3: Add all the products obtained.


$\text{So,}2\times 4\times 5\times 7\text{= 280}$