Determine the HCF of 45 and 35 by using prime factors.
Write down ALL the factors of 78, in factor pairs.
Is 185 divisible by 5? Use the divisibility rule — do NOT do the actual division.
Determine the LCM of 24 and 84 by using prime factors.
Express 28 as a product of prime factors, using exponents.
Write down ALL the factors of 27, in factor pairs.
Determine the LCM of 60 and 48 by using prime factors.
Determine the HCF of 72 and 64 by using prime factors.
Write down ALL the factors of 41, in factor pairs.
Show that the HCF of 48 and 36 is 12.
Determine the HCF of 16 and 14 by using prime factors.
Is 103 prime or composite? Show why.
