# Test: Factors I - Challenging

Double click on maths expressions to zoom
Question 1:   What is LCM (the Least Common Multiple) of $25$ and $105$ ?
$250$
$2625$
$1050$
$525$
Question 2:   What is LCM of $14$ and $196$ ?
$2744$
$196$
$1372$
$392$
Question 3:   What is LCM of $12,15$
$60$
$72$
$90$
$75$
Question 4:   Write $108$ as a product of prime numbers
$27\cdot 4$
$2\cdot 2\cdot 3\cdot 3\cdot 5$
$2\cdot 2\cdot 3\cdot 3\cdot 3$
$11\cdot 11$
Question 5:   Write $99$ as a product of prime numbers
$2\cdot 2\cdot 3\cdot 11$
$3\cdot 3\cdot 11$
$3\cdot 3\cdot 3\cdot 2\cdot 2$
$2\cdot 3\cdot 3\cdot 3\cdot 3$
Question 6:   Write $186$ as a product of prime numbers
$3\cdot 3\cdot 3\cdot 3\cdot 5$
$2\cdot 3\cdot 31$
$2\cdot 2\cdot 3\cdot 3\cdot 11$
$2\cdot 3\cdot 3\cdot 5\cdot 11$
Question 7:   What is HCF (the Highest Common Factor) of $116,24$ ?
$4$
$2$
$1$
$12$
Question 8:   What is HCF of $425$ and $952$ ?
$17$
$85$
$68$
$1$
Question 9:   What is HCF of $320$ and $860$ ?
$32$
$320$
$40$
$20$
Question 10:   Solve: ${2}^{5}\cdot {3}^{2}\cdot 5\cdot 7$
$2520$
$10080$
$5040$
$10800$