📚 Topic Summary
Rounding helps us simplify numbers to make them easier to work with. When rounding three-digit numbers to the nearest hundred, we look at the tens digit. If the tens digit is 5 or greater, we round up to the next hundred. If it's 4 or less, we round down to the previous hundred. For example, 362 rounds to 400, and 342 rounds to 300. Think of it like this: is the number closer to the hundred before it, or the hundred after it?
Rounding to the nearest hundred is like finding the closest 'century mark' for any given number. It's super useful in estimating sums and differences quickly!
🔤 Part A: Vocabulary
- 📈 Rounding: Estimating a number to the nearest ten, hundred, thousand, etc.
- 💯 Nearest Hundred: The multiple of 100 that a number is closest to.
- 🔢 Tens Digit: The second digit from the right in a number.
- ⬇️ Round Down: To change a number to a smaller value.
- ⬆️ Round Up: To change a number to a larger value.
Match the term to its definition:
- Round Up
- Tens Digit
- Rounding
- Round Down
- Nearest Hundred
Definitions (Mix and Match):
- The multiple of 100 that a number is closest to.
- Estimating a number to the nearest ten, hundred, thousand, etc.
- To change a number to a larger value.
- To change a number to a smaller value.
- The second digit from the right in a number.
✍️ Part B: Fill in the Blanks
When rounding to the nearest hundred, we look at the ______ digit. If this digit is 5 or more, we ______ ______. If it's 4 or less, we ______ ______. So, 678 rounded to the nearest hundred is ______, and 621 rounded to the nearest hundred is ______.
🤔 Part C: Critical Thinking
Imagine you have 234 apples and your friend has 765 apples. If you round each number to the nearest hundred, about how many apples do you have in total? Explain your reasoning.