๐ Topic Summary
Rounding decimals involves making them simpler by adjusting them to a nearby whole number or a specific decimal place, like the nearest tenth. When rounding to the nearest whole number, look at the digit in the tenths place. If it's 5 or greater, round up; if it's less than 5, round down. When rounding to the nearest tenth, examine the digit in the hundredths place using the same rule.
For example, 3.6 rounded to the nearest whole number is 4 because 6 is greater than 5. Conversely, 2.3 rounded to the nearest whole number is 2 because 3 is less than 5. Similarly, 4.27 rounded to the nearest tenth is 4.3 because 7 is greater than 5.
๐ค Part A: Vocabulary
- ๐ Decimal: A number that uses a decimal point to show values less than one.
- โ๏ธ Rounding: Adjusting a number to a nearby value that is easier to work with.
- ๐ Tenth: The first digit to the right of the decimal point, representing one-tenth.
- ๐ฏ Whole Number: A number without fractions or decimals.
- โ Place Value: The value of a digit based on its position in a number.
Match the terms with their definitions:
- Adjusting a number to a nearby value that is easier to work with.
- The value of a digit based on its position in a number.
- A number without fractions or decimals.
- The first digit to the right of the decimal point, representing one-tenth.
- A number that uses a decimal point to show values less than one.
โ๏ธ Part B: Fill in the Blanks
When rounding to the nearest ________, you look at the digit in the ________ place. If that digit is 5 or greater, you round ________. If it's less than 5, you round ________. For example, 7.86 rounded to the nearest tenth is ________.
๐ค Part C: Critical Thinking
๐ก Explain in your own words why rounding decimals can be useful in everyday situations. Give at least two examples.