You’ve uploaded a math worksheet titled
“(25) Adding 3 Numbers, 3-Digit Addition”, which contains 25 problems — each asking you to add three 3-digit numbers.
I’ll solve
all 25 problems step by step and provide the answers. I’ll also explain the method briefly for clarity.
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🧮 How to Add Three 3-Digit Numbers:
1.
Align the numbers vertically by place value (hundreds, tens, ones).
2.
Add column by column, starting from the
right (ones place).
3.
Carry over any sum greater than 9 to the next column.
4. Repeat for tens, then hundreds.
Let’s solve each problem:
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##
✔ Problem Set Solutions:
Row 1:
1.
513 + 613 + 813
= 513 + 613 = 1126 → 1126 + 813 =
1939
2.
800 + 173 + 449
= 800 + 173 = 973 → 973 + 449 =
1422
3.
482 + 186 + 863
= 482 + 186 = 668 → 668 + 863 =
1531
4.
308 + 371 + 219
= 308 + 371 = 679 → 679 + 219 =
898
5.
686 + 656 + 202
= 686 + 656 = 1342 → 1342 + 202 =
1544
---
Row 2:
6.
227 + 281 + 965
= 227 + 281 = 508 → 508 + 965 =
1473
7.
472 + 554 + 605
= 472 + 554 = 1026 → 1026 + 605 =
1631
8.
552 + 870 + 116
= 552 + 870 = 1422 → 1422 + 116 =
1538
9.
813 + 836 + 162
= 813 + 836 = 1649 → 1649 + 162 =
1811
10.
157 + 205 + 146
= 157 + 205 = 362 → 362 + 146 =
508
---
Row 3:
11.
977 + 774 + 749
= 977 + 774 = 1751 → 1751 + 749 =
2500
12.
131 + 968 + 685
= 131 + 968 = 1099 → 1099 + 685 =
1784
13.
655 + 872 + 977
= 655 + 872 = 1527 → 1527 + 977 =
2504
14.
321 + 351 + 411
= 321 + 351 = 672 → 672 + 411 =
1083
15.
650 + 203 + 406
= 650 + 203 = 853 → 853 + 406 =
1259
---
Row 4:
16.
544 + 734 + 145
= 544 + 734 = 1278 → 1278 + 145 =
1423
17.
567 + 923 + 987
= 567 + 923 = 1490 → 1490 + 987 =
2477
18.
681 + 212 + 574
= 681 + 212 = 893 → 893 + 574 =
1467
19.
624 + 929 + 461
= 624 + 929 = 1553 → 1553 + 461 =
2014
20.
425 + 279 + 840
= 425 + 279 = 704 → 704 + 840 =
1544
---
Row 5:
21.
593 + 848 + 495
= 593 + 848 = 1441 → 1441 + 495 =
1936
22.
623 + 453 + 305
= 623 + 453 = 1076 → 1076 + 305 =
1381
23.
485 + 486 + 217
= 485 + 486 = 971 → 971 + 217 =
1188
24.
616 + 718 + 395
= 616 + 718 = 1334 → 1334 + 395 =
1729
25.
835 + 266 + 786
= 835 + 266 = 1101 → 1101 + 786 =
1887
---
##
✔ Final Answer Key (All 25 Problems):
1.
1939
2.
1422
3.
1531
4.
898
5.
1544
6.
1473
7.
1631
8.
1538
9.
1811
10.
508
11.
2500
12.
1784
13.
2504
14.
1083
15.
1259
16.
1423
17.
2477
18.
1467
19.
2014
20.
1544
21.
1936
22.
1381
23.
1188
24.
1729
25.
1887
---
## 📝 Tips for Students:
- Always line up digits correctly.
- Double-check carries — it’s easy to miss one!
- Practice with smaller numbers first if needed.
- You can check your work by adding in a different order (commutative property).
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✔ All problems solved! You can now fill in the worksheet or use this as an answer key. Let me know if you’d like a printable version or step-by-step breakdown for any specific problem!
Parent Tip: Review the logic above to help your child master the concept of adding three number worksheet.
