Math worksheet featuring ten column addition problems with large numbers, designed for practicing addition skills.

Let's solve each of these column addition problems step by step. We'll use standard column addition, adding digits from right to left, carrying over when necessary.

---

1)

```
2728391708235
+ 828304798272
-----------------
```

Align the numbers:
```
2728391708235
+ 828304798272
-----------------
```

Add:

Start from the rightmost digit:

- 5 + 2 = 7
- 3 + 7 = 10 → write 0, carry 1
- 2 + 8 + 1 = 11 → write 1, carry 1
- 8 + 9 + 1 = 18 → write 8, carry 1
- 0 + 7 + 1 = 8
- 7 + 4 = 11 → write 1, carry 1
- 1 + 0 + 1 = 2
- 9 + 7 = 16 → write 6, carry 1
- 3 + 9 + 1 = 13 → write 3, carry 1
- 8 + 8 + 1 = 17 → write 7, carry 1
- 2 + 2 + 1 = 5
- 7 + 8 = 15 → write 5, carry 1
- 2 + 3 + 1 = 6
- 7 + 0 = 7
- 2 + 8 = 10 → write 0, carry 1
- 7 + 2 + 1 = 10 → write 0, carry 1
- 2 + 0 + 1 = 3

So, result:
3556696406507

✔ Answer: 3,556,696,406,507

---

2)

```
3748294610234
+ 836179402717
-----------------
```

Align:
```
3748294610234
+ 836179402717
-----------------
```

Add:

- 4 + 7 = 11 → 1, carry 1
- 3 + 1 + 1 = 5
- 2 + 7 = 9
- 0 + 2 = 2
- 1 + 0 = 1
- 6 + 4 = 10 → 0, carry 1
- 4 + 0 + 1 = 5
- 9 + 9 = 18 → 8, carry 1
- 2 + 7 + 1 = 10 → 0, carry 1
- 8 + 6 + 1 = 15 → 5, carry 1
- 4 + 3 + 1 = 8
- 7 + 8 = 15 → 5, carry 1
- 3 + 0 + 1 = 4

Result:
4584474012951

✔ Answer: 4,584,474,012,951

---

3)

```
3928179204772
+ 372842721103
-----------------
```

Align:
```
3928179204772
+ 372842721103
-----------------
```

Add:

- 2 + 3 = 5
- 7 + 0 = 7
- 7 + 1 = 8
- 4 + 1 = 5
- 0 + 1 = 1
- 2 + 2 = 4
- 9 + 7 = 16 → 6, carry 1
- 7 + 2 + 1 = 10 → 0, carry 1
- 1 + 8 + 1 = 10 → 0, carry 1
- 8 + 4 + 1 = 13 → 3, carry 1
- 2 + 7 + 1 = 10 → 0, carry 1
- 9 + 3 + 1 = 13 → 3, carry 1
- 3 + 0 + 1 = 4

Result:
4300021925875

✔ Answer: 4,300,021,925,875

---

4)

```
3728298110954
+ 8372810803862
-----------------
```

Align:
```
3728298110954
+ 8372810803862
-----------------
```

Add:

- 4 + 2 = 6
- 5 + 6 = 11 → 1, carry 1
- 9 + 8 + 1 = 18 → 8, carry 1
- 0 + 3 + 1 = 4
- 1 + 0 = 1
- 1 + 8 = 9
- 8 + 0 = 8
- 9 + 8 = 17 → 7, carry 1
- 2 + 1 + 1 = 4
- 8 + 0 = 8
- 7 + 7 = 14 → 4, carry 1
- 2 + 3 + 1 = 6
- 3 + 8 = 11 → 1, carry 1
- 0 + 0 + 1 = 1

Wait — let’s align properly (both are 13-digit numbers):

```
3728298110954
+ 8372810803862
------------------
```

Now add column by column from right:

- 4+2=6
- 5+6=11 → 1, carry 1
- 9+8+1=18 → 8, carry 1
- 0+3+1=4
- 1+0=1
- 1+8=9
- 8+0=8
- 9+8=17 → 7, carry 1
- 2+1+1=4
- 8+0=8
- 7+7=14 → 4, carry 1
- 2+3+1=6
- 3+8=11 → 1, carry 1
- 0+0+1=1

Wait! First number is 13 digits, second is also 13 digits:

Actually:

3728298110954 → 13 digits
8372810803862 → 13 digits

So:

```
3728298110954
+ 8372810803862
-------------------
```

From right:

- 4+2=6
- 5+6=11 → 1, carry 1
- 9+8+1=18 → 8, carry 1
- 0+3+1=4
- 1+0=1
- 1+8=9
- 8+0=8
- 9+8=17 → 7, carry 1
- 2+1+1=4
- 8+0=8
- 7+7=14 → 4, carry 1
- 2+3+1=6
- 3+8=11 → 1, carry 1
- 0+0+1=1

So result: 12,101,108,914,816

✔ Answer: 12,101,108,914,816

---

5)

```
6307183748301
+ 8370183746215
-----------------
```

Add:

- 1+5=6
- 0+1=1
- 3+2=5
- 8+6=14 → 4, carry 1
- 4+4+1=9
- 7+7=14 → 4, carry 1
- 3+3+1=7
- 8+8=16 → 6, carry 1
- 1+0+1=2
- 7+3=10 → 0, carry 1
- 0+7+1=8
- 3+0=3
- 6+8=14 → 4, carry 1
- 0+0+1=1

So: 14,677,367,514,516

✔ Answer: 14,677,367,514,516

---

6)

```
8372846110380
+ 4739820188493
-----------------
```

Add:

- 0+3=3
- 8+9=17 → 7, carry 1
- 3+4+1=8
- 0+8=8
- 1+8=9
- 1+1=2
- 6+0=6
- 1+8=9
- 4+1=5
- 8+2=10 → 0, carry 1
- 2+0+1=3
- 7+3=10 → 0, carry 1
- 3+7+1=11 → 1, carry 1
- 8+4+1=13 → 3, carry 1
- 0+0+1=1

Result: 13,112,666,298,873

✔ Answer: 13,112,666,298,873

---

7)

Three numbers:
```
3920172839402
+ 883747177321
+ 287308811025
-----------------
```

First add first two:

#### Step 1: Add 3920172839402 + 883747177321

Align:
```
3920172839402
+ 883747177321
-----------------
```

- 2+1=3
- 0+2=2
- 4+3=7
- 9+7=16 → 6, carry 1
- 3+7+1=11 → 1, carry 1
- 8+7+1=16 → 6, carry 1
- 2+1+1=4
- 7+7=14 → 4, carry 1
- 1+4+1=6
- 0+3=3
- 2+8=10 → 0, carry 1
- 9+8+1=18 → 8, carry 1
- 3+0+1=4

So: 4,803,919,916,723

Now add third number:
4,803,919,916,723 + 287,308,811,025

Align:
```
4803919916723
+ 287308811025
-----------------
```

- 3+5=8
- 2+2=4
- 7+0=7
- 6+1=7
- 1+1=2
- 9+8=17 → 7, carry 1
- 1+1+1=3
- 9+8=17 → 7, carry 1
- 1+3+1=5
- 3+7=10 → 0, carry 1
- 0+8+1=9
- 8+2=10 → 0, carry 1
- 4+0+1=5

Result: 5,091,228,727,748

✔ Answer: 5,091,228,727,748

---

8)

```
6503927173820
+ 1029847338472
+ 493828717113
-----------------
```

First: 6503927173820 + 1029847338472

Add:

- 0+2=2
- 2+7=9
- 8+4=12 → 2, carry 1
- 3+8+1=12 → 2, carry 1
- 7+3+1=11 → 1, carry 1
- 1+3+1=5
- 7+7=14 → 4, carry 1
- 2+3+1=6
- 9+8=17 → 7, carry 1
- 3+4+1=8
- 0+2=2
- 5+0=5
- 6+1=7

→ 7,533,774,512,292

Now add 493,828,717,113:

```
7533774512292
+ 493828717113
-----------------
```

- 2+3=5
- 9+1=10 → 0, carry 1
- 2+1+1=4
- 2+7=9
- 1+1=2
- 2+7=9
- 5+8=13 → 3, carry 1
- 4+2+1=7
- 7+3=10 → 0, carry 1
- 3+8+1=12 → 2, carry 1
- 3+9+1=13 → 3, carry 1
- 5+4+1=10 → 0, carry 1
- 7+0+1=8

Result: 8,027,603,229,405

✔ Answer: 8,027,603,229,405

---

9)

```
3282371028392
+ 43819304519
+ 1741938123661
-----------------
```

First: 3282371028392 + 43819304519

Align:

```
3282371028392
+ 43819304519
-----------------
```

- 2+9=11 → 1, carry 1
- 9+1+1=11 → 1, carry 1
- 3+5+1=9
- 8+4=12 → 2, carry 1
- 2+0+1=3
- 0+3=3
- 1+9=10 → 0, carry 1
- 0+8+1=9
- 7+1=8
- 3+3=6
- 2+8=10 → 0, carry 1
- 8+4+1=13 → 3, carry 1
- 2+0+1=3
- 3+0=3

So: 3,326,190,332,911

Now add 1,741,938,123,661:

```
3326190332911
+ 1741938123661
-----------------
```

- 1+1=2
- 1+6=7
- 9+6=15 → 5, carry 1
- 2+3+1=6
- 3+2=5
- 3+1=4
- 0+8=8
- 3+3=6
- 9+8=17 → 7, carry 1
- 1+1+1=3
- 2+4=6
- 3+7=10 → 0, carry 1
- 3+1+1=5

Result: 5,068,128,456,572

✔ Answer: 5,068,128,456,572

---

10)

```
58370174287
+ 1298394173920
+ 8443718845671
-----------------
```

Note: First number has 11 digits, others have 13 digits.

Write as:

```
58370174287
+ 1298394173920
+ 8443718845671
-------------------
```

First: Add 58,370,174,287 + 1,298,394,173,920

→ 1,356,764,348,207

Now add 8,443,718,845,671:

```
1356764348207
+ 8443718845671
-----------------
```

- 7+1=8
- 0+7=7
- 2+6=8
- 8+5=13 → 3, carry 1
- 4+4+1=9
- 3+8=11 → 1, carry 1
- 4+8+1=13 → 3, carry 1
- 6+1+1=8
- 7+8=15 → 5, carry 1
- 5+4+1=10 → 0, carry 1
- 3+3+1=7
- 1+4=5
- 0+8=8

So: 9,799,483,193,878

✔ Answer: 9,799,483,193,878

---

✔ Final Answers:

1) 3,556,696,406,507
2) 4,584,474,012,951
3) 4,300,021,925,875
4) 12,101,108,914,816
5) 14,677,367,514,516
6) 13,112,666,298,873
7) 5,091,228,727,748
8) 8,027,603,229,405
9) 5,068,128,456,572
10) 9,799,483,193,878

Let me know if you'd like a printable version or check any particular one!