Let's try adding in two ways. First, you'll find the exact answers. Then, you'll estimate each number by rounding to the nearest hundred before adding.

Estimating helps you get a rough idea of what the actual answer should be. To round to the nearest hundred, look at the tens digit. If it's 4 or less, round down (example: 203 becomes 200.) If it's 5 or more, round up (example: 587 becomes 600.) So when you estimate 203 + 587, you're really solving 200 + 600, which equals 800. Now, grab your pencil and complete the rest!