📚 Topic Summary
Rounding decimals is a way of simplifying a decimal number to a certain place value. When rounding, you look at the digit to the right of the place value you're rounding to. If that digit is 5 or greater, you round up. If it's less than 5, you round down. This helps us make estimations and work with numbers that are easier to manage.
For example, to round 3.14159 to the nearest hundredth, we look at the digit in the thousandths place, which is 1. Since 1 is less than 5, we round down, and 3.14159 becomes 3.14.
🔤 Part A: Vocabulary
Match the terms with their correct definitions.
| Term |
Definition |
| 1. Decimal |
A. The place value immediately to the right of the ones place. |
| 2. Rounding |
B. A method to reduce the number of digits in a number while keeping its value similar. |
| 3. Tenths Place |
C. The number system based on 10. |
| 4. Hundredths Place |
D. A number that uses a decimal point to show values less than one. |
| 5. Base Ten |
E. The place value two positions to the right of the decimal. |
Match the correct term to the definition by writing the correct letter next to the number.
✍️ Part B: Fill in the Blanks
Complete the sentences with the correct words.
When rounding to the nearest tenth, look at the _______ place. If the digit in the hundredths place is 5 or _______, round the tenths place up. If it is less than 5, leave the tenths place _______. To round 4.56 to the nearest tenth, you would look at the digit _______. Since 6 is greater than 5, 4.56 rounded to the nearest tenth is _______.
🤔 Part C: Critical Thinking
Explain in your own words why rounding decimals is a useful skill in everyday life. Provide at least two examples.