Question

$20\times 6=$ $\times 10$

• A. $12$
• B. $8$
• C. $6$

Answer 1

The correct option is A $12$

$20\times 6=\text{\_\_\_\_\_\_}\times 10$
20 can be written as $4\times 5=2\times 2\times 5$
$\Rightarrow 20\times 6=2\times 2\times 5\times 6\text{\_\_\_\_\_\_}\times 10$
Now, by associative property of multiplication:
$\Rightarrow 2\times (2\times 5)\times 6=\text{\_\_\_\_\_\_}\times 10$
$\Rightarrow 2\times 6\times 10=\text{\_\_\_\_\_\_}\times 10$
Again using the associative property:
$\Rightarrow (2\times 6)\times 10=\text{\_\_\_\_\_\_}\times 10$
$\Rightarrow 12\times 10=\text{\_\_\_\_\_\_}\times 10$
Comparing we get the recquired number as $12$