Rounding informally to the nearest ten means replacing a two-digit whole number with the closest multiple of ten by judging its position between consecutive tens. On a number line, numbers with 0–4 ones are closer to the lower ten, while numbers with 5–9 ones are closer to the higher ten; exact tens remain unchanged. This understanding supports estimation and place-value reasoning, without extending to decimals, negative numbers, or more advanced rounding ranges.
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Detailed Explanation: Round informally to the nearest ten
To round a two-digit whole number to the nearest ten:
- Find the two tens the number is between.
- Look at the ones digit.
- If it is or , round down to the lower ten.
- If it is or , round up to the higher ten.
- The answer ends in .
Example: Round to the nearest ten
- is between and .
- The ones digit in is .
- Since is or more, round up to .
Therefore,
The symbol means “is about equal to.”
Learn by doing: Round informally to the nearest ten
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Practice:
Rounding Whole Numbers - Tens to Nearest Ten
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Download/Modify Free Grade 2 'Round informally to the nearest ten' Worksheet
Print this free 'Round informally to the nearest ten' worksheet to practice this skill away from the computer. Click 'Modify' to easily customize this worksheet to your exact needs.
This Worksheet Includes:
- Rounding Whole Numbers - Tens to Nearest Ten
- Words to Number Equivalents - Power of Ten
- Addition - Whole Number - Add 10 to a Number
- Subtraction - Whole Number - Subtract Multiples of 10
- Base 10 Blocks - Counting - Picture to Word, Tens and Ones
- Base 10 Blocks - Counting - Number to Picture, Tens and Ones
- Subtraction - Whole Number - Subtract Multiple of 10 from a Number - Columns
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