Question

Which prime factorisation correctly helps simplify `14/21`?

Options

• (2 × 7) / (3 × 7)

• (2 × 5) / (3 × 5)

• (2 × 3) / (7 × 2)

• (2 × 7) / (2 × 3)

Answer 1

(2 × 7) / (3 × 7)

Explanation:

14 = 2 × 7 and 21 = 3 × 7.

Cancel the common factor 7; the result is `2/3`.