Procedure: How to Round Decimals
Rounding decimals is a Grade 5 math skill in enVision Mathematics, Chapter 1: Understand Place Value. To round a decimal to a given place value, identify the digit in that place, then look at the digit immediately to its right: if it is 5 or greater, round up (add 1 to the target digit); if it is less than 5, round down (keep the target digit unchanged). Digits to the right of the rounding place are replaced with zeros or dropped.
Key Concepts
To round a decimal to a given place value, identify the digit in that place. Then, look at the digit immediately to its right. If the digit to the right is $5$ or greater ($\geq 5$), add one to the digit in the rounding place. If the digit to the right is less than $5$ ($< 5$), the digit in the rounding place stays the same.
Finally, drop all digits to the right of the rounding place.
Common Questions
How do you round a decimal to a given place value?
Identify the digit in the rounding place, then look at the digit to its right. If that digit is 5 or more, round up; if it is 4 or less, round down (keep the digit unchanged).
How do you round 3.746 to the nearest tenth?
The tenths digit is 7. The next digit is 4, which is less than 5, so keep the 7 unchanged: 3.746 rounded to the nearest tenth is 3.7.
How do you round 2.385 to the nearest hundredth?
The hundredths digit is 8. The next digit is 5, so round up: 2.385 rounded to the nearest hundredth is 2.39.
Where is rounding decimals taught in enVision Grade 5?
Chapter 1: Understand Place Value in enVision Mathematics, Grade 5.
Why do we round decimals?
Rounding makes decimals easier to work with in estimation, mental math, and real-world contexts where exact precision is not necessary.