The distributive property states that you can "distribute" the contents of one parentheses into the other to find an answer. Let's first break down the larger number in the second parentheses: 400 + 10 + 5. Then, let's multiply all those numbers by 3. 400 x 3 = 1200. 10 x 3 = 30. 5 x 3 = 15. Then add up all the numbers and you get 1245.