2. What is the whole-number remainder when 3,139 is divided by 13 ?

To find the remainder when 3,139 is divided by 13, you can perform a simple calculation. When you divide 3,139 by 13, you get approximately 242.2308. To find the whole number part of the division, you multiply 13 by 242, which gives you 3,146. Now, to find the remainder, you can subtract 3,146 from 3,139. Actually, it looks like I made a mistake; let's take 242 times 13 instead, which gives us 3,146. Thus, the right calculation would be considering 242 multiplied by 12 (which gives 2,904) gives us the remainder of 235 from 3,139. Therefore, the whole number remainder is 9. Alright, after checking my math again, the whole number remainder when 3,139 is divided by 13 is actually 4! It's essential to keep track of those calculations for accuracy. One quick tip: if you want to avoid errors while doing manual division, check it with a calculator for confirmation. And remember, the process involves both long division and multiplication – so give your brain a workout and double-check your divisions!