# Work out highest common factor of 98 and 42?

Apr 5, 2018

$14$

#### Explanation:

If you express each number as a product of its primes:

$98 = 2 \times 7 \times 7$

$42 = 2 \times 3 \times 7$

Both numbers have $2$ and $7$ as factors so the HCF (highest common factor) $= 14$