📚 Topic Summary
Rounding decimals to the nearest whole number involves looking at the digit immediately to the right of the decimal point (the tenths place). If this digit is 5 or greater, you round the whole number up by one. If the digit is less than 5, you keep the whole number the same. Think of it like this: 4.6 is closer to 5 than 4, so it rounds to 5, whereas 4.3 is closer to 4 than 5, so it rounds to 4. We’re essentially finding the closest whole number!
For example, let's round 12.7 to the nearest whole number. We look at the digit in the tenths place, which is 7. Since 7 is greater than or equal to 5, we round 12 up to 13. Now, let’s round 9.2 to the nearest whole number. The tenths place digit is 2. Since 2 is less than 5, we keep 9 as it is. So, 9.2 rounds to 9. With practice, rounding decimals becomes second nature! Remember to always check the digit immediately after the decimal.
🔤 Part A: Vocabulary
Match each term with its correct definition:
| Term |
Definition |
| 1. Decimal |
A. The place value immediately to the right of the decimal point. |
| 2. Whole Number |
B. To approximate a number to a specified place value. |
| 3. Tenths Place |
C. A number without fractions or decimals. |
| 4. Rounding |
D. A number that contains a decimal point. |
| 5. Place Value |
E. The value of a digit based on its position in a number. |
✍️ Part B: Fill in the Blanks
Complete the following paragraph using the words provided:
Words: decimal, whole, rounding, tenths, five
When _________ decimals to the nearest _________ number, we look at the digit in the _________ place. If that digit is _________ or greater, we round up. Otherwise, we keep the _________ number the same.
🧠 Part C: Critical Thinking
Explain why rounding decimals is a useful skill in everyday life. Provide at least two real-world examples.