19 × 12 + 19 = 19 × (12 + _____)

By distributive property, we know that if a, b and c are whole numbers,

Then, a × (b + c)= (a × b) + (a × c)

19 × 12 + 19 = 19 × 12 + 19 × 1

19 × 12 + 19 = 19 × (12 + 1)