What is the largest multiple of 30 which is less than 520?
I want to find a multiple of 30 that is close to 520, but not more than it. I can start by dividing 520 by 30 to see how many times 30 goes into 520. I get 17 with a remainder of 10. This means that 17 times 30 is 510, which is the largest multiple of 30 that is less than 520. I can check this by adding 30 to 510 and seeing that it is more than 520. So the answer is 510. 