- There are eight Prime Numbers Under 20
- Many people are unsure whether they have listed them all so it can help to draw the grid out and put them all into it – 4 under 10 then 4 more between 10 and 20
- One is not a prime
- Two IS a prime

- There are eight Prime Numbers Under 20
- Many people are unsure whether they have listed them all so it can help to draw the grid out and put them all into it – 4 under 10 then 4 more between 10 and 20
- One is not a prime
- Two IS a prime

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