2nd Grade 3-Digit Addition Multi Addends Worksheet with 20 problems for practice.
3-digit addition math worksheet with multiple addends for 2nd grade students, featuring 20 problems and a playful dinosaur logo.
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Show Answer Key & Explanations
Step-by-step solution for: 3 Digit Addition Regrouping Worksheets
▼
Show Answer Key & Explanations
Step-by-step solution for: 3 Digit Addition Regrouping Worksheets
Let’s solve each problem step by step. We’ll add the numbers carefully, one at a time.
---
1) 327 + 468
Start with ones: 7 + 8 = 15 → write 5, carry 1
Tens: 2 + 6 + 1 (carry) = 9
Hundreds: 3 + 4 = 7
→ 795
---
2) 536 + 482
Ones: 6 + 2 = 8
Tens: 3 + 8 = 11 → write 1, carry 1
Hundreds: 5 + 4 + 1 = 10 → write 0, carry 1 → but no more digits, so it’s 1018? Wait — let’s check:
Actually:
536
+482
= (500+400)=900, (30+80)=110, (6+2)=8 → 900+110=1010+8=1018 → yes.
But wait — this is 3-digit addition, and answer can be 4-digit. That’s fine.
→ 1018
Wait — let me recalculate properly:
536
+ 482
------
Ones: 6+2=8
Tens: 3+8=11 → write 1, carry 1
Hundreds: 5+4=9 +1=10 → write 0, carry 1 → then thousands: 1
So: 1018
Yes.
---
3) 731 + 566
Ones: 1+6=7
Tens: 3+6=9
Hundreds: 7+5=12 → write 2, carry 1 → so 1297? Let's do:
731
+ 566
------
Ones: 1+6=7
Tens: 3+6=9
Hundreds: 7+5=12 → so result is 1297
→ 1297
---
4) 629 + 478
Ones: 9+8=17 → write 7, carry 1
Tens: 2+7+1=10 → write 0, carry 1
Hundreds: 6+4+1=11 → write 1, carry 1 → so 1107
Check: 629 + 478 = (600+400)=1000, (20+70)=90, (9+8)=17 → 1000+90=1090+17=1107 → correct.
→ 1107
---
5) 397 + 254
Ones: 7+4=11 → write 1, carry 1
Tens: 9+5+1=15 → write 5, carry 1
Hundreds: 3+2+1=6
→ 651
---
6) 673 + 485
Ones: 3+5=8
Tens: 7+8=15 → write 5, carry 1
Hundreds: 6+4+1=11 → write 1, carry 1 → so 1158
Check: 673 + 485 = 600+400=1000, 70+80=150, 3+5=8 → 1000+150=1150+8=1158 → correct.
→ 1158
---
7) 379 + 256
Ones: 9+6=15 → write 5, carry 1
Tens: 7+5+1=13 → write 3, carry 1
Hundreds: 3+2+1=6
→ 635
---
8) 905 + 476
Ones: 5+6=11 → write 1, carry 1
Tens: 0+7+1=8
Hundreds: 9+4=13 → write 3, carry 1 → so 1381
Check: 905 + 476 = 900+400=1300, 0+70=70, 5+6=11 → 1300+70=1370+11=1381 → correct.
→ 1381
---
Now problems with 3 addends:
9) 324 + 156 + 123
Add first two: 324 + 156
Ones: 4+6=10 → write 0, carry 1
Tens: 2+5+1=8
Hundreds: 3+1=4 → so 480
Then 480 + 123:
Ones: 0+3=3
Tens: 8+2=10 → write 0, carry 1
Hundreds: 4+1+1=6
→ 603
Alternatively, add all together:
324
156
+ 123
------
Ones: 4+6+3=13 → write 3, carry 1
Tens: 2+5+2+1=10 → write 0, carry 1
Hundreds: 3+1+1+1=6
→ 603
Same.
---
10) 403 + 256 + 127
Ones: 3+6+7=16 → write 6, carry 1
Tens: 0+5+2+1=8
Hundreds: 4+2+1=7
→ 786
Check: 403+256=659; 659+127=786 → yes.
---
11) 341 + 137 + 65
Note: 65 is two digits — align to right.
Write as:
341
137
+ 65
------
Ones: 1+7+5=13 → write 3, carry 1
Tens: 4+3+6+1=14 → write 4, carry 1
Hundreds: 3+1+0+1=5
→ 543
Check: 341+137=478; 478+65=543 → yes.
---
12) 251 + 174 + 58
251
174
+ 58
------
Ones: 1+4+8=13 → write 3, carry 1
Tens: 5+7+5+1=18 → write 8, carry 1
Hundreds: 2+1+0+1=4
→ 483
Check: 251+174=425; 425+58=483 → yes.
---
13) 325 + 273 + 106
Ones: 5+3+6=14 → write 4, carry 1
Tens: 2+7+0+1=10 → write 0, carry 1
Hundreds: 3+2+1+1=7
→ 704
Check: 325+273=598; 598+106=704 → yes.
---
14) 427 + 152 + 216
Ones: 7+2+6=15 → write 5, carry 1
Tens: 2+5+1+1=9
Hundreds: 4+1+2=7
→ 795
Check: 427+152=579; 579+216=795 → yes.
---
15) 526 + 164 + 75
526
164
+ 75
------
Ones: 6+4+5=15 → write 5, carry 1
Tens: 2+6+7+1=16 → write 6, carry 1
Hundreds: 5+1+0+1=7
→ 765
Check: 526+164=690; 690+75=765 → yes.
---
16) 438 + 361 + 46
438
361
+ 46
------
Ones: 8+1+6=15 → write 5, carry 1
Tens: 3+6+4+1=14 → write 4, carry 1
Hundreds: 4+3+0+1=8
→ 845
Check: 438+361=799; 799+46=845 → yes.
---
17) 481 + 157 + 232
Ones: 1+7+2=10 → write 0, carry 1
Tens: 8+5+3+1=17 → write 7, carry 1
Hundreds: 4+1+2+1=8
→ 870
Check: 481+157=638; 638+232=870 → yes.
---
18) 624 + 315 + 46
624
315
+ 46
------
Ones: 4+5+6=15 → write 5, carry 1
Tens: 2+1+4+1=8
Hundreds: 6+3+0=9
→ 985
Check: 624+315=939; 939+46=985 → yes.
---
19) 306 + 245 + 77
306
245
+ 77
------
Ones: 6+5+7=18 → write 8, carry 1
Tens: 0+4+7+1=12 → write 2, carry 1
Hundreds: 3+2+0+1=6
→ 628
Check: 306+245=551; 551+77=628 → yes.
---
20) 432 + 371 + 258
Ones: 2+1+8=11 → write 1, carry 1
Tens: 3+7+5+1=16 → write 6, carry 1
Hundreds: 4+3+2+1=10 → write 0, carry 1 → so 1061
Check: 432+371=803; 803+258=1061 → yes.
→ 1061
---
Final Answers:
1) 795
2) 1018
3) 1297
4) 1107
5) 651
6) 1158
7) 635
8) 1381
9) 603
10) 786
11) 543
12) 483
13) 704
14) 795
15) 765
16) 845
17) 870
18) 985
19) 628
20) 1061
──────────────────────────────────────
Final Answer:
1) 795
2) 1018
3) 1297
4) 1107
5) 651
6) 1158
7) 635
8) 1381
9) 603
10) 786
11) 543
12) 483
13) 704
14) 795
15) 765
16) 845
17) 870
18) 985
19) 628
20) 1061
---
1) 327 + 468
Start with ones: 7 + 8 = 15 → write 5, carry 1
Tens: 2 + 6 + 1 (carry) = 9
Hundreds: 3 + 4 = 7
→ 795
---
2) 536 + 482
Ones: 6 + 2 = 8
Tens: 3 + 8 = 11 → write 1, carry 1
Hundreds: 5 + 4 + 1 = 10 → write 0, carry 1 → but no more digits, so it’s 1018? Wait — let’s check:
Actually:
536
+482
= (500+400)=900, (30+80)=110, (6+2)=8 → 900+110=1010+8=1018 → yes.
But wait — this is 3-digit addition, and answer can be 4-digit. That’s fine.
→ 1018
Wait — let me recalculate properly:
536
+ 482
------
Ones: 6+2=8
Tens: 3+8=11 → write 1, carry 1
Hundreds: 5+4=9 +1=10 → write 0, carry 1 → then thousands: 1
So: 1018
Yes.
---
3) 731 + 566
Ones: 1+6=7
Tens: 3+6=9
Hundreds: 7+5=12 → write 2, carry 1 → so 1297? Let's do:
731
+ 566
------
Ones: 1+6=7
Tens: 3+6=9
Hundreds: 7+5=12 → so result is 1297
→ 1297
---
4) 629 + 478
Ones: 9+8=17 → write 7, carry 1
Tens: 2+7+1=10 → write 0, carry 1
Hundreds: 6+4+1=11 → write 1, carry 1 → so 1107
Check: 629 + 478 = (600+400)=1000, (20+70)=90, (9+8)=17 → 1000+90=1090+17=1107 → correct.
→ 1107
---
5) 397 + 254
Ones: 7+4=11 → write 1, carry 1
Tens: 9+5+1=15 → write 5, carry 1
Hundreds: 3+2+1=6
→ 651
---
6) 673 + 485
Ones: 3+5=8
Tens: 7+8=15 → write 5, carry 1
Hundreds: 6+4+1=11 → write 1, carry 1 → so 1158
Check: 673 + 485 = 600+400=1000, 70+80=150, 3+5=8 → 1000+150=1150+8=1158 → correct.
→ 1158
---
7) 379 + 256
Ones: 9+6=15 → write 5, carry 1
Tens: 7+5+1=13 → write 3, carry 1
Hundreds: 3+2+1=6
→ 635
---
8) 905 + 476
Ones: 5+6=11 → write 1, carry 1
Tens: 0+7+1=8
Hundreds: 9+4=13 → write 3, carry 1 → so 1381
Check: 905 + 476 = 900+400=1300, 0+70=70, 5+6=11 → 1300+70=1370+11=1381 → correct.
→ 1381
---
Now problems with 3 addends:
9) 324 + 156 + 123
Add first two: 324 + 156
Ones: 4+6=10 → write 0, carry 1
Tens: 2+5+1=8
Hundreds: 3+1=4 → so 480
Then 480 + 123:
Ones: 0+3=3
Tens: 8+2=10 → write 0, carry 1
Hundreds: 4+1+1=6
→ 603
Alternatively, add all together:
324
156
+ 123
------
Ones: 4+6+3=13 → write 3, carry 1
Tens: 2+5+2+1=10 → write 0, carry 1
Hundreds: 3+1+1+1=6
→ 603
Same.
---
10) 403 + 256 + 127
Ones: 3+6+7=16 → write 6, carry 1
Tens: 0+5+2+1=8
Hundreds: 4+2+1=7
→ 786
Check: 403+256=659; 659+127=786 → yes.
---
11) 341 + 137 + 65
Note: 65 is two digits — align to right.
Write as:
341
137
+ 65
------
Ones: 1+7+5=13 → write 3, carry 1
Tens: 4+3+6+1=14 → write 4, carry 1
Hundreds: 3+1+0+1=5
→ 543
Check: 341+137=478; 478+65=543 → yes.
---
12) 251 + 174 + 58
251
174
+ 58
------
Ones: 1+4+8=13 → write 3, carry 1
Tens: 5+7+5+1=18 → write 8, carry 1
Hundreds: 2+1+0+1=4
→ 483
Check: 251+174=425; 425+58=483 → yes.
---
13) 325 + 273 + 106
Ones: 5+3+6=14 → write 4, carry 1
Tens: 2+7+0+1=10 → write 0, carry 1
Hundreds: 3+2+1+1=7
→ 704
Check: 325+273=598; 598+106=704 → yes.
---
14) 427 + 152 + 216
Ones: 7+2+6=15 → write 5, carry 1
Tens: 2+5+1+1=9
Hundreds: 4+1+2=7
→ 795
Check: 427+152=579; 579+216=795 → yes.
---
15) 526 + 164 + 75
526
164
+ 75
------
Ones: 6+4+5=15 → write 5, carry 1
Tens: 2+6+7+1=16 → write 6, carry 1
Hundreds: 5+1+0+1=7
→ 765
Check: 526+164=690; 690+75=765 → yes.
---
16) 438 + 361 + 46
438
361
+ 46
------
Ones: 8+1+6=15 → write 5, carry 1
Tens: 3+6+4+1=14 → write 4, carry 1
Hundreds: 4+3+0+1=8
→ 845
Check: 438+361=799; 799+46=845 → yes.
---
17) 481 + 157 + 232
Ones: 1+7+2=10 → write 0, carry 1
Tens: 8+5+3+1=17 → write 7, carry 1
Hundreds: 4+1+2+1=8
→ 870
Check: 481+157=638; 638+232=870 → yes.
---
18) 624 + 315 + 46
624
315
+ 46
------
Ones: 4+5+6=15 → write 5, carry 1
Tens: 2+1+4+1=8
Hundreds: 6+3+0=9
→ 985
Check: 624+315=939; 939+46=985 → yes.
---
19) 306 + 245 + 77
306
245
+ 77
------
Ones: 6+5+7=18 → write 8, carry 1
Tens: 0+4+7+1=12 → write 2, carry 1
Hundreds: 3+2+0+1=6
→ 628
Check: 306+245=551; 551+77=628 → yes.
---
20) 432 + 371 + 258
Ones: 2+1+8=11 → write 1, carry 1
Tens: 3+7+5+1=16 → write 6, carry 1
Hundreds: 4+3+2+1=10 → write 0, carry 1 → so 1061
Check: 432+371=803; 803+258=1061 → yes.
→ 1061
---
Final Answers:
1) 795
2) 1018
3) 1297
4) 1107
5) 651
6) 1158
7) 635
8) 1381
9) 603
10) 786
11) 543
12) 483
13) 704
14) 795
15) 765
16) 845
17) 870
18) 985
19) 628
20) 1061
──────────────────────────────────────
Final Answer:
1) 795
2) 1018
3) 1297
4) 1107
5) 651
6) 1158
7) 635
8) 1381
9) 603
10) 786
11) 543
12) 483
13) 704
14) 795
15) 765
16) 845
17) 870
18) 985
19) 628
20) 1061
Parent Tip: Review the logic above to help your child master the concept of 3 digit addition worksheet free.
