Place value
Whole-number place-value chart
Read the twelve whole-number places from hundred billions through ones. A fixed example, 123,456,789,012, connects each digit with its place and the full number name.
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Adding commas and digit-group separators worksheets
Group large whole numbers in threes from the right. Practice 4–15 digits or mixed widths, with fifteen questions and an answer key using the chosen print language’s separators.
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Read the ungrouped digits and rewrite the number using one separator between each three-digit group, working from the right.
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Learning objective
What this activity builds
Recognize three-digit periods and insert separators without changing the digits or their order.
Worked example
Insert commas into 7080300205.
7,080,300,205
Split from the right: 7 | 080 | 300 | 205. Later groups keep all three digits, including zeros. The leftmost group may contain one, two or three digits.
Teaching notes
Make the practice count
- English sheets use commas. German, Spanish, Italian and Turkish sheets use points; Albanian, French and Norwegian sheets use spaces. These are the site’s explicit print conventions, not a claim that every classroom uses the same style.
- Start with four or five digits, then increase the width. Fifteen digits are available for extended period practice.
- Each sheet has fifteen distinct digit strings. Mixed practice chooses from the widths you select.
- The prompt spaces digits for writing clarity. The response uses normal numeral spacing and the selected grouping convention.
- This activity groups whole numbers only. No decimal marks need to be inserted.
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