Answer:
2
Step-by-step explanation:
4 = 2 * 2
10 = 2 * 5
12 = 2 * 2 * 3
16 = 2 * 2 * 2 *2
GCF is 2.
GCF is just the greatest factor of the whole number series.
Everything is divisible by 2 and not anything greater in this number series.
Therefore the GCF is 2.
