An interactive lesson on prime numbers built around the Sieve of Eratosthenes. After recapping prime and composite numbers, students cross out 1 and colour the multiples of 2, 3, 5 and 7 on a 100 square to reveal all the prime numbers below 100.
What this presentation covers
- what a prime number is
- why 1 is not a prime number
- composite numbers
- the 100 square method (Sieve of Eratosthenes)
- the prime numbers up to 100
Level: KS2 / KS3
Slides: 22
Format: PowerPoint (.pptx)
Contributed by: Jyotirmayee Sahu