Round informally to the nearest ten

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.

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 $0,1,2,3,$ or $4$ , round down to the lower ten.
- If it is $5,6,7,8,$ or $9$ , round up to the higher ten.
The answer ends in $0$ .

Example: Round $67$ to the nearest ten

$67$ is between $60$ and $70$ .
The ones digit in $67$ is $7$ .
Since $7$ is $5$ or more, round up to $70$ .

Therefore,

67 \approx 70

The symbol $\approx$ means “is about equal to.”

Learn by doing: Round informally to the nearest ten

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Rounding Whole Numbers - Tens to Nearest Ten

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