Learn about how triangle sequences, quadratic sequences and the common difference with this BBC Bitesize Maths article. For students between the ages of 11 and 14.

Watch as Vi creates patterns, using Pascal's Triangle to explore relationships in number. See what happens when she circles the odd numbers. What rule does she use to create the final pattern?

The triangular formation can be arranged in different ways but still use the same number of dots each time. ... Looking at the difference between consecutive terms can also reveal the pattern.