4th grade math Worksheets, word lists and activities. | GreatSchools - Free Printable

Let's solve each part of the worksheet step by step.

---

1. Find each sum.

We are adding decimals. Let’s go through each one carefully.

#### a)
```
4.121
+ 2.485
-------
```

Add column by column from right to left:

- Thousandths: 1 + 5 = 6
- Hundredths: 2 + 8 = 10 → write 0, carry 1
- Tenths: 1 + 4 + 1 (carry) = 6
- Units: 4 + 2 = 6

So:
4.121 + 2.485 = 6.606

---

#### b)
```
3.794
+ 5.732
-------
```

- Thousandths: 4 + 2 = 6
- Hundredths: 9 + 3 = 12 → write 2, carry 1
- Tenths: 7 + 7 + 1 = 15 → write 5, carry 1
- Units: 3 + 5 + 1 = 9

So:
3.794 + 5.732 = 9.526

---

#### c)
```
6.782
+ 8.139
-------
```

- Thousandths: 2 + 9 = 11 → write 1, carry 1
- Hundredths: 8 + 3 + 1 = 12 → write 2, carry 1
- Tenths: 7 + 1 + 1 = 9
- Units: 6 + 8 = 14 → write 4, carry 1
- Tens: 1 (carry)

So:
6.782 + 8.139 = 14.921

---

2. Find each sum.

#### a)
```
2.842
+ 3.451
-------
```

- Thousandths: 2 + 1 = 3
- Hundredths: 4 + 5 = 9
- Tenths: 8 + 4 = 12 → write 2, carry 1
- Units: 2 + 3 + 1 = 6

→ 6.293

---

#### b)
```
4.325
+ 2.853
-------
```

- Thousandths: 5 + 3 = 8
- Hundredths: 2 + 5 = 7
- Tenths: 3 + 8 = 11 → write 1, carry 1
- Units: 4 + 2 + 1 = 7

→ 7.178

---

#### c)
```
2.473
+ 5.251
-------
```

- Thousandths: 3 + 1 = 4
- Hundredths: 7 + 5 = 12 → write 2, carry 1
- Tenths: 4 + 2 + 1 = 7
- Units: 2 + 5 = 7

→ 7.724

---

#### d)
```
1.482
+ 2.915
-------
```

- Thousandths: 2 + 5 = 7
- Hundredths: 8 + 1 = 9
- Tenths: 4 + 9 = 13 → write 3, carry 1
- Units: 1 + 2 + 1 = 4

→ 4.397

---

#### e)
```
6.241
+ 3.609
-------
```

- Thousandths: 1 + 9 = 10 → write 0, carry 1
- Hundredths: 4 + 0 + 1 = 5
- Tenths: 2 + 6 = 8
- Units: 6 + 3 = 9

→ 9.850

---

#### f)
```
4.842
+ 2.149
-------
```

- Thousandths: 2 + 9 = 11 → write 1, carry 1
- Hundredths: 4 + 4 + 1 = 9
- Tenths: 8 + 1 = 9
- Units: 4 + 2 = 6

→ 6.991

---

3. Write the answer in the box.

#### a)
1.961 + 1.204 = ?

- 1.961 + 1.204 = 3.165

→ 3.165

---

#### b)
2.531 + 4.236 = ?

- 2.531 + 4.236 = 6.767

→ 6.767

---

#### c)
2.031 + 3.641 = ?

- 2.031 + 3.641 = 5.672

→ 5.672

---

#### d)
3.038 + 4.281 = ?

- 3.038 + 4.281 = 7.319

→ 7.319

---

4. Write the missing number in the box.

We are given sums and one addend; find the missing addend.

#### a)
```
2.442
+ ?
------
4.712
```

To find the missing number:
4.712 - 2.442 = ?

Subtract:

- Thousandths: 2 - 2 = 0
- Hundredths: 1 - 4 → can't do, borrow: 11 - 4 = 7
- Tenths: 6 (after borrow) - 4 = 2
- Units: 4 - 2 = 2

Wait:
4.712
-2.442
= 2.270

So: 2.270

But let's check:
2.442 + 2.270 = 4.712 ✔

→ 2.270

---

#### b)
```
1.374
+ ?
------
3.428
```

3.428 - 1.374 = ?

- 3.428
-1.374
= 2.054

Check: 1.374 + 2.054 = 3.428 ✔

→ 2.054

---

#### c)
```
3.628
+ ?
------
5.815
```

5.815 - 3.628 = ?

- 5.815
-3.628
= 2.187

Check: 3.628 + 2.187 = 5.815 ✔

→ 2.187

---

Word Problems

#### 1.
3,617 people went to the local concert on Saturday night, and 3,289 people went on Sunday night. How many people went to the concert over both nights?

Add:
3,617 + 3,289

Break it down:

- 3,617 + 3,289
= (3,000 + 3,000) + (617 + 289)
= 6,000 + 906 = 6,906

Or directly:

```
3,617
+ 3,289
-------
6,906
```

✔ So, 6,906 people attended over both nights.

---

#### 2.
6,512 people went to the rock concert on Saturday night, and 3,813 people went on Sunday night. How many people went to the concert over both nights?

Add:
6,512 + 3,813

```
6,512
+ 3,813
-------
10,325
```

- Units: 2 + 3 = 5
- Tens: 1 + 1 = 2
- Hundreds: 5 + 8 = 13 → write 3, carry 1
- Thousands: 6 + 3 + 1 = 10

So: 10,325

✔ Answer: 10,325 people attended over both nights.

---

✔ Final Answers Summary:

#### Section 1:
- 4.121 + 2.485 = 6.606
- 3.794 + 5.732 = 9.526
- 6.782 + 8.139 = 14.921

#### Section 2:
- 2.842 + 3.451 = 6.293
- 4.325 + 2.853 = 7.178
- 2.473 + 5.251 = 7.724
- 1.482 + 2.915 = 4.397
- 6.241 + 3.609 = 9.850
- 4.842 + 2.149 = 6.991

#### Section 3:
- 1.961 + 1.204 = 3.165
- 2.531 + 4.236 = 6.767
- 2.031 + 3.641 = 5.672
- 3.038 + 4.281 = 7.319

#### Section 4:
- Missing number: 2.270
- Missing number: 2.054
- Missing number: 2.187

#### Word Problems:
- Total attendees: 6,906
- Total attendees: 10,325

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