Factors - LCM and HCF

The students in a classroom can be divided into five equal groups or six equal groups. Find the smallest possible number of students in the classroom.

Is 6410 divisible by 15?

LCM OF 2,3 and 5

• 30

• 60

• 15

• 10

HCF of 14 and 28

LCM and HCF of 13 and 21 are _________ and _____ respectively

• 1 and 273

• 273 and 1

• 13 and 273

• 273 and 13

Which answer lists all the factors for 40?

• 1,2,4,5,8,12,14,40

• 1,2,3,4,5,8,10

• 1,2,4,5,8,10,20,40

• 1,2,4,5,6,7,8,9,10

Product of Power of Primes of 240 are _________

• 2³ x 3 x 5

• 2⁴ x 3 x 5

• 2⁵ x 3 x 5

• 2⁶ x 3 x 5

Product of primes of 84

x is a whole number. The HCF of x an 8 is 4. The LCM of x and 5 is 60. Find x.

Liam makes 32 chocolate biscuits and 40 ginger biscuits. He puts the biscuits into boxes. Each box contains the same number of chocolate biscuits and the same number of ginger biscuits. Find the largest possible number of boxes.