Step-by-step explanation:
To write 8 + 20 as a product, factor out a common factor.
To find the greatest common factor, write the prime factorizations.
8 = 2³
20 = 2² × 5
GCF = 2²
The greatest common factor is 4. So if we factor out a 4 from the sum:
8 + 20
= 4 (2 + 5)
= 4 × 7
