Quadratic equations, square roots, cubic, factorisation, positive integers, C1.

[STEP I 2007 Question 6 (Pure)]

Integers, digits, number of, C1.

[STEP I 1998 Question 1 (Pure)]

Positive integers, divisibility, factorial function, C1.

[STEP II 1987 Question 1 (Pure)]

Positive integers, digits in base 10, zeros, factorial. C1

[STEP I Specimen Question 5 (Pure)]