# Sigma Prime Lite

## Decompose numbers using prime factorisation

Decompose numbers using their prime factors to defeat the alien invasions.

## Selection of related activities

Curriculum-aligned activities

• ### Short division

Refine and use efficient written methods to divide HTU by U. Use efficient written methods to divide integers and decimals by a one-digit integer.

• ### Factors and multiples

Find factors and multiples of a number including listing factors in pairs to find all the factors of large numbers. Find common multiples and lowest/least common multiples without the use of the Product of Prime Factors, simple cases only. Find common factors and highest common factor (HCF), including using the term divisor and use given results as an aid.

• ### Prime numbers

Understand the definition of a prime number as an integer with exactly 2 factors and be able to test for a number being prime. Know that 2 is the first prime number and the only even prime number.

• ### Find prime factors

Find the prime factors of two-digit numbers.

• ### Product of prime factors

Know the terms product of prime factors and prime factor decomposition. Use a factor tree or similar method to decompose numbers including writing the answer in index form.

• ### Square numbers

Recognise and calculate the square number sequence up to 144 and also include simple higher values, e.g. 400, 10000. Understand the square roots as the reverse process of squaring. Only consider positive square roots.

## How to teach Number using Mangahigh

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