A letter represents an unknown number or a variable that can take different values

In algebra, what does a letter like "x" or "n" represent?

The nth term rule is 2n + 1. What is the 5th term?

The sequence is 5, 8, 11, 14... What is the nth term rule?

A function machine does: input → ×3 → +5 → output. If input is 4, what is the output?

A function machine does: input → ×4 → -6 → output. If output is 14, what was the input?

Tom is x years old. His sister is 5 years younger. Write an expression for his sister's age.

Pens cost p pence each. Write an expression for the cost of 8 pens.

I think of a number, multiply it by 4, then add 6. The answer is 30. What was my number?

The perimeter of a square is 4s. If the perimeter is 48cm, what is the side length s?

Three consecutive numbers add up to 24. What is the smallest number? (Use n, n+1, n+2)

If a = 2 and b = 5, find the value of 3a + 2b

If n > 5 and n is a whole number less than 9, what are the possible values of n?

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