Prime factors, HCF and LCM Flashcards
To be able to write a number as its product of prime factors To use venn diagrams to find the HCF and LCM of two numbers
1
Q
Write 18 as a product of its prime factors
A
2 x 3 x 3
2
Q
Write 28 as a product of its prime factors
A
2 x 2 x 7
3
Q
Write 200 as a product of its prime factors
A
2 x 2 x 2 x 5 x 5
4
Q
Find the LCM of 15 and 35
A
105
5
Q
Find the LCM of 42 and 90
A
630
6
Q
Find the HCF of 21 and 49
A
7
7
Q
Find the HCF of 18 and 24
A
6
8
Q
What is the definition of a factor
A
Factors are numbers that we can multiply together to give another number. E.g. the factors of 12 are: 1, 2, 3, 4, 6, 12
9
Q
What is the definition of a multiple
A
The numbers in the times table of another number. E.g. the first 5 multiples of 7 are: 7, 14, 21, 28, 35
