## 4. Indices – Word Problems

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Indices – Word Problems (Indices, Powers or Exponents) Solving simple word problems by looking for patterns using indices (or exponents or powers)……. Also explains exponential growth, “the second half of the chessboard” , and Moore’s Law.

## 3. Indices – an Introduction

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Indices : the First 4 Laws (Indices, Powers or Exponents) Introduces students to the first 4 laws of indices with many examples.

## 1. Prime Numbers

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In this video, Teacher Jon introduces secondary students to the primes, making use of the sieve of Eratosthenes, and looks at twin primes, the spread of the primes, Euclid’s proof of the infinity of the primes and Mersenne primes. Video Lesson: Download Worksheet (PDF): NUMBER THEORY – Prime Numbers

## 2. Fibonacci Numbers

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In this video, Teacher Jon introduces the Fibonacci sequence using the question posed by Fibonacci in 1202, and continues with some applications of these numbers , in architecture, art, design and nature. Video Lesson: Download Worksheet (PDF): NUMBER THEORY – Fibonacci Numbers

## 5. Factors and Multiples – The HCF and the LCM

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In this lesson, Teacher Jon explains Factors and Multiples, as well as the Highest Common Factors and Lowest Common Multiples. Video Lesson: Download Worksheet (PDF): NUMBER THEORY- Factors and Multiples.