Patterns

Look at the triangular numbers pattern: $1, 3, 6, 10, \dots$. What is the next number?

Identify the next term in the pattern: $30, 60, 90, 120, \dots$

Find the missing number in the sequence: $4, 9, 14, 19, \dots$

If you rotate the digit '9' by a $\frac{1}{2}$ turn, it looks like which digit?

What is the next number in the pattern: $2, 12, 22, 32, ...$?

Which number pattern follows the rule 'Subtract $6$'?

If a magic triangle's sides sum to $10$, and two numbers on a side are $2$ and $5$, what is the third number on that side?

A magic square must have an equal number of rows and ________.

If the sum of the first row is $15$ and the sum of the second row is $15$, what must be the sum of the third row?