Remember, a prime numbers can only be divided by itself and 1. You can use your knowledge of multiples (times tables) to eliminate numbers. Start with the smallest numbers and work your way up.

Another way to think of prime numbers is that they are only ever found as answers in their own times tables. 11 is a prime number because the only factors of 11 are 1 and 11 (\(1 \times 11 = 11\)).