Question

which is the set of natural numbers that are factors of 8?
{2, 4}
{3, 5}
{1, 2, 4}
{1, 2, 4, 8}

Explanation:

Step1: Define factor of 8

A natural number factor of 8 divides 8 without remainder.

Step2: List all such factors

Test natural numbers:
$8 \div 1 = 8$ (no remainder), $8 \div 2 = 4$ (no remainder), $8 \div 4 = 2$ (no remainder), $8 \div 8 = 1$ (no remainder).

Answer:

{1, 2, 4, 8}