Convert to Standard Form 4 Digits Sheet 3: A math worksheet with 40 addition problems for practicing converting sums to standard form, ideal for 4th-grade students.

Let's solve each problem step by step. The goal is to convert expanded forms into standard form (i.e., combine the numbers to write them as a single number) or fill in the missing number when given a sum.

We'll go through each one, explaining how to get the answer.

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Problems 1–20: Add the numbers to find the standard form

1) $1000 + 500 + 28 = 1528$
→ $1000 + 500 = 1500$, $1500 + 28 = 1528$

2) $2000 + 700 + 14 = 2714$
→ $2000 + 700 = 2700$, $2700 + 14 = 2714$

3) $800 + 5000 + 23 = 5823$
→ $5000 + 800 = 5800$, $5800 + 23 = 5823$

4) $20 + 6000 + 5 = 6025$
→ $6000 + 20 = 6020$, $6020 + 5 = 6025$

5) $800 + 9 + 1000 = 1809$
→ $1000 + 800 = 1800$, $1800 + 9 = 1809$

6) $7000 + 500 + 80 = 7580$
→ $7000 + 500 = 7500$, $7500 + 80 = 7580$

7) $4000 + 2 + 500 = 4502$
→ $4000 + 500 = 4500$, $4500 + 2 = 4502$

8) $92 + 7000 + 300 = 7392$
→ $7000 + 300 = 7300$, $7300 + 92 = 7392$

9) $15 + 200 + 1000 = 1215$
→ $1000 + 200 = 1200$, $1200 + 15 = 1215$

10) $100 + 6000 + 76 = 6176$
→ $6000 + 100 = 6100$, $6100 + 76 = 6176$

11) $2000 + 52 = 2052$
→ $2000 + 52 = 2052$

12) $70 + 300 + 8000 = 8370$
→ $8000 + 300 = 8300$, $8300 + 70 = 8370$

13) $1000 + 381 = 1381$
→ $1000 + 381 = 1381$

14) $1400 + 12 = 1412$
→ $1400 + 12 = 1412$

15) $2300 + 48 = 2348$
→ $2300 + 48 = 2348$

16) $7000 + 520 + 1 = 7521$
→ $7000 + 520 = 7520$, $7520 + 1 = 7521$

17) $640 + 9000 + 3 = 9643$
→ $9000 + 640 = 9640$, $9640 + 3 = 9643$

18) $34 + 5600 = 5634$
→ $5600 + 34 = 5634$

19) $1700 + 7 + 50 = 1757$
→ $1700 + 50 = 1750$, $1750 + 7 = 1757$

20) $8 + 6300 + 90 = 6398$
→ $6300 + 90 = 6390$, $6390 + 8 = 6398$

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Problems 21–40: Fill in the blank to make the equation true

21) $400 + 24 + \_\_\_\_\_ = 2424$
→ Total needed: $2424 - 400 - 24 = 2000$
→ Answer: 2000

22) $\_\_\_\_\_ + 56 = 3056$
→ $3056 - 56 = 3000$
→ Answer: 3000

23) $4000 + \_\_\_\_\_ + 48 = 4548$
→ $4548 - 4000 - 48 = 500$
→ Answer: 500

24) $7000 + \_\_\_\_\_ + 100 = 7163$
→ $7163 - 7000 - 100 = 63$
→ Answer: 63

25) $54 + \_\_\_\_\_ + 100 = 6154$
→ $6154 - 54 - 100 = 6000$
→ Answer: 6000

26) $3000 + \_\_\_\_\_ + 13 = 3713$
→ $3713 - 3000 - 13 = 700$
→ Answer: 700

27) $\_\_\_\_\_ + 56 + 200 = 8256$
→ $8256 - 56 - 200 = 8000$
→ Answer: 8000

28) $\_\_\_\_\_ + 8000 + 300 = 8349$
→ $8349 - 8000 - 300 = 49$
→ Answer: 49

29) $5000 + \_\_\_\_\_ = 5207$
→ $5207 - 5000 = 207$
→ Answer: 207

30) $1000 + \_\_\_\_\_ = 1348$
→ $1348 - 1000 = 348$
→ Answer: 348

31) $7000 + 400 + \_\_\_\_\_ = 7419$
→ $7419 - 7000 - 400 = 19$
→ Answer: 19

32) $8000 + \_\_\_\_\_ + 7 = 8327$
→ $8327 - 8000 - 7 = 320$
→ Answer: 320

33) $1000 + \_\_\_\_\_ + 3 = 1753$
→ $1753 - 1000 - 3 = 750$
→ Answer: 750

34) $\_\_\_\_\_ + 7000 + 9 = 7249$
→ $7249 - 7000 - 9 = 240$
→ Answer: 240

35) $\_\_\_\_\_ + 65 = 2465$
→ $2465 - 65 = 2400$
→ Answer: 2400

36) $\_\_\_\_\_ + 93 = 7893$
→ $7893 - 93 = 7800$
→ Answer: 7800

37) $4000 + 7 + \_\_\_\_\_ = 4387$
→ $4387 - 4000 - 7 = 380$
→ Answer: 380

38) $\_\_\_\_\_ + 6000 + 80 = 6781$
→ $6781 - 6000 - 80 = 701$
→ Answer: 701

39) $\_\_\_\_\_ + 40 + 2000 = 2149$
→ $2149 - 40 - 2000 = 109$
→ Answer: 109

40) $\_\_\_\_\_ + 8 = 1648$
→ $1648 - 8 = 1640$
→ Answer: 1640

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✔ Final Answers:

| # | Answer |
|---|--------|
| 1) | 1528 |
| 2) | 2714 |
| 3) | 5823 |
| 4) | 6025 |
| 5) | 1809 |
| 6) | 7580 |
| 7) | 4502 |
| 8) | 7392 |
| 9) | 1215 |
|10) | 6176 |
|11) | 2052 |
|12) | 8370 |
|13) | 1381 |
|14) | 1412 |
|15) | 2348 |
|16) | 7521 |
|17) | 9643 |
|18) | 5634 |
|19) | 1757 |
|20) | 6398 |
|21) | 2000 |
|22) | 3000 |
|23) | 500 |
|24) | 63 |
|25) | 6000 |
|26) | 700 |
|27) | 8000 |
|28) | 49 |
|29) | 207 |
|30) | 348 |
|31) | 19 |
|32) | 320 |
|33) | 750 |
|34) | 240 |
|35) | 2400 |
|36) | 7800 |
|37) | 380 |
|38) | 701 |
|39) | 109 |
|40) | 1640 |

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🔍 Explanation Summary:

- For problems 1–20: Add all the parts together.
- For problems 21–40: Subtract the known values from the total to find the missing number.
- Always start from the largest place value (thousands, then hundreds, etc.) when adding or subtracting.

This worksheet helps reinforce understanding of place value and number composition.

Let me know if you'd like this in printable format or with explanations for specific problems!