Question

Write the least $2$ digit number that has $2,5$ and $8$ as factors.

• A. $80$
• B. $40$
• C. $16$
• D. $10$

Answer 1

The correct option is B $40$

The least 2 - digit number required will be the LCM of $2,5,8$
To find LCM, we first write all numbers as the product of their prime numbers.

So, $2=1\times 2$
$5=1\times 5$
$8=1\times 2\times 2\times 2$

$\therefore LCM=1\times 2\times 2\times 2\times 5=8\times 5=40.$