Value & Place Value Worksheets - Free Printable

You're looking at a math worksheet titled “Inserting Commas”, which teaches students how to correctly place commas in large numbers according to the standard U.S. convention: insert a comma every three digits from the right.

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✔ Rule Recap:

In the United States (and many other countries), we use commas to separate groups of three digits starting from the rightmost digit (the ones place). This makes large numbers easier to read.

Examples:
- 1000 → 1,000
- 10000 → 10,000
- 100000 → 100,000
- 1000000 → 1,000,000

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🔍 Let’s Solve Each Problem:

We’ll go one by one and explain how to insert the comma(s).

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#### 1) `4 8 5` → 485
- Only 3 digits → no comma needed.
✔ Answer: 485

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#### 2) `9 4 0 0 1` → 94,001
- Count from right: 1 (ones), 0 (tens), 0 (hundreds) → group of 3 → comma before next digit.
- So: `94,001`
✔ Answer: 94,001

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#### 3) `6 6 5` → 665
- Only 3 digits → no comma.
✔ Answer: 665

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#### 4) `2 9 5 7` → 2,957
- From right: 7,5,9 → first group of 3 → comma before 2.
✔ Answer: 2,957

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#### 5) `6 4 3 9 7 4 2` → 6,439,742
- From right: 742 (first group), then 439 (next group), then 6.
✔ Answer: 6,439,742

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#### 6) `6 4 6 6 0 6 4 4 5` → 646,606,445
- From right: 445 → 606 → 646
✔ Answer: 646,606,445

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#### 7) `3 6 3 3 9 0` → 363,390
- From right: 390 → 363
✔ Answer: 363,390

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#### 8) `9 4 7 7 3 0 9` → 9,477,309
- From right: 309 → 477 → 9
✔ Answer: 9,477,309

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#### 9) `7 9 2 5 1 5 0 1 1` → 792,515,011
- From right: 011 → 515 → 792
✔ Answer: 792,515,011

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#### 10) `6 4 5 7 1 6 2 6` → 64,571,626
- From right: 626 → 571 → 64
✔ Answer: 64,571,626

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#### 11) `8 4 2 9` → 8,429
- From right: 429 → 8
✔ Answer: 8,429

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#### 12) `5 3 7 6 0 6` → 537,606
- From right: 606 → 537
✔ Answer: 537,606

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#### 13) `3 3 4 6` → 3,346
- From right: 346 → 3
✔ Answer: 3,346

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#### 14) `1 4 6 5 1 8 6` → 1,465,186
- From right: 186 → 465 → 1
✔ Answer: 1,465,186

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#### 15) `8 8 2` → 882
- Only 3 digits → no comma.
✔ Answer: 882

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#### 16) `8 0 7 1 4 3 4 0` → 80,714,340
- From right: 340 → 714 → 80
✔ Answer: 80,714,340

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#### 17) `4 9 1 7 7` → 49,177
- From right: 177 → 49
✔ Answer: 49,177

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#### 18) `7 3 5 4 8` → 73,548
- From right: 548 → 73
✔ Answer: 73,548

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#### 19) `3 6 1 3 8 9 4 3 8` → 361,389,438
- From right: 438 → 389 → 361
✔ Answer: 361,389,438

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#### 20) `1 4 9 2 4 0 4 3` → 14,924,043
- From right: 043 → 924 → 14
✔ Answer: 14,924,043

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🧠 Summary:

This worksheet reinforces place value understanding and number formatting for readability. The key is to start from the right and count three digits at a time, inserting a comma after each group — except before the leftmost group if it has fewer than 3 digits.

All answers provided in the “Answer Key” column are correct!

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✔ Final Tip: When writing or reading large numbers, always remember:
> Commas go every 3 digits from the RIGHT.

Let me know if you want a printable version or more practice problems!