# 1EM Unit 1 – Primes, HCF and LCM

Learning Objectives:
• Understand the definition of prime numbers and composite numbers.
• Determine whether a whole number is prime or composite.
• Express a composite number as the product of its prime factors, i.e., perform the prime factorisation.
• Solve problems involving perfect square, perfect cube, square root, or cube root using prime factorisation.
• Find the highest common factor (HCF) and the lowest common multiple (LCM) of two or more whole numbers.
• Solve problems involving the real-world applications of prime numbers, HCF and LCM.

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• 6 Lessons
• 51 Questions