Adding and Subtracting Decimals Worksheets - Math Monks - Free Printable

Let's solve each problem step by step on the Adding and Subtracting Decimals Worksheet.

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🔹 Addition Problems

#### 1. 28.32 + 9.13
```
28.32
+ 9.13
-------
37.45
```
✔ Answer: 37.45

> Align decimals, add column by column:
> - 2 + 3 = 5 (hundredths)
> - 3 + 1 = 4 (tenths)
> - 8 + 9 = 17 → carry over 1
> - 2 + 0 + 1 = 3 → 37.45

---

#### 2. 13.14 + 28.36
```
13.14
+ 28.36
-------
41.50
```
✔ Answer: 41.50

> Add:
> - 4 + 6 = 10 → write 0, carry 1
> - 1 + 3 + 1 = 5
> - 3 + 8 = 11 → carry 1
> - 1 + 2 + 1 = 4 → 41.50

---

#### 3. 163.741 + 243.002
```
163.741
+ 243.002
---------
406.743
```
✔ Answer: 406.743

> Line up decimals:
> - 1 + 2 = 3 (thousandths)
> - 4 + 0 = 4 (hundredths)
> - 7 + 0 = 7 (tenths)
> - 3 + 3 = 6 (ones)
> - 6 + 4 = 10 → carry 1
> - 1 + 2 + 1 = 4 → 406.743

---

#### 4. 86.93 + 74.12
```
86.93
+ 74.12
-------
161.05
```
✔ Answer: 161.05

> Add:
> - 3 + 2 = 5
> - 9 + 1 = 10 → write 0, carry 1
> - 6 + 4 + 1 = 11 → write 1, carry 1
> - 8 + 7 + 1 = 16 → 161.05

---

#### 5. 11.19 + 0.88
```
11.19
+ 0.88
-------
12.07
```
✔ Answer: 12.07

> Add:
> - 9 + 8 = 17 → write 7, carry 1
> - 1 + 8 + 1 = 10 → write 0, carry 1
> - 1 + 0 + 1 = 2 → 12.07

---

🔹 Subtraction Problems

#### 1. 100.81 - 3.92
```
100.81
- 3.92
--------
96.89
```
✔ Answer: 96.89

> Borrow carefully:
> - 1 < 2 → borrow from 8 → 11 - 2 = 9
> - 7 (after borrowing) < 9 → borrow from 0 → becomes 17 - 9 = 8
> - 9 (after borrow) - 3 = 6
> - 0 (after borrow) - 0 = 0
> - 1 - 0 = 1 → but we borrowed → 0 → so it’s 96.89

Wait — better way:

Actually:
```
100.81
- 3.92
--------
96.89
```

Yes:
- 81 - 92 → can't do → borrow from 0 → but need to go to hundreds.
- So: 100.81 → becomes 99.181? No.

Better:
```
100.81
- 3.92
```

Align:
```
100.81
- 3.92
--------
```

→ 100.81 - 3.92

We can think of it as:
= 100.81 - 3.92
= (100.81 - 4.00) + 0.08 = 96.81 + 0.08 = 96.89 ✔

Or directly:
- Hundredths: 1 - 2 → borrow → 11 - 2 = 9
- Tenths: 7 (after borrow) - 9 → borrow → 17 - 9 = 8
- Units: 9 (after borrow) - 3 = 6
- Tens: 9 (after borrow) - 0 = 9
- Hundreds: 0

So → 96.89

✔ Answer: 96.89

---

#### 2. 99.23 - 19.09
```
99.23
- 19.09
-------
80.14
```
✔ Answer: 80.14

> 3 - 9 → borrow → 13 - 9 = 4
> 1 (after borrow) - 0 = 1
> 8 (after borrow) - 9 → borrow → 18 - 9 = 9
> 8 (after borrow) - 1 = 7 → wait, let's align properly:

```
99.23
- 19.09
-------
80.14
```

- 3 - 9 → borrow → 13 - 9 = 4
- 1 (from 2) → 1 - 0 = 1
- 8 (from 9) - 9 → borrow → 18 - 9 = 9
- 8 (from 9) - 1 = 7 → but wait: 99.23 - 19.09

Actually:
- 99.23
- 19.09
→ 99.23 - 19.09 = ?

Do it:
- 99.23 - 19.09 = (99.23 - 19) - 0.09 = 80.23 - 0.09 = 80.14 ✔

✔ Answer: 80.14

---

#### 3. 62.97 - 59.13
```
62.97
- 59.13
-------
3.84
```
✔ Answer: 3.84

> 7 - 3 = 4
> 9 - 1 = 8
> 2 - 9 → borrow → 12 - 9 = 3
> 5 (after borrow) - 5 = 0 → 3.84

Wait:
- 62.97 - 59.13
- 97 - 13 = 84
- 62 - 59 = 3 → so 3.84 ✔

✔ Answer: 3.84

---

#### 4. 65.42 - 64.39
```
65.42
- 64.39
-------
1.03
```
✔ Answer: 1.03

> 2 - 9 → borrow → 12 - 9 = 3
> 3 (after borrow) - 3 = 0
> 5 - 4 = 1
> 6 - 6 = 0 → 1.03 ✔

✔ Answer: 1.03

---

#### 5. 9.91 - 7.37
```
9.91
- 7.37
------
2.54
```
✔ Answer: 2.54

> 1 - 7 → borrow → 11 - 7 = 4
> 8 (after borrow) - 3 = 5
> 9 - 7 = 2 → 2.54 ✔

✔ Answer: 2.54

---

#### 6. 69.39 - 60.11
```
69.39
- 60.11
-------
9.28
```
✔ Answer: 9.28

> 9 - 1 = 8
> 3 - 1 = 2
> 9 - 0 = 9
> 6 - 6 = 0 → 9.28 ✔

✔ Answer: 9.28

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✔ Final Answers:

#### Addition:
1. 28.32 + 9.13 = 37.45
2. 13.14 + 28.36 = 41.50
3. 163.741 + 243.002 = 406.743
4. 86.93 + 74.12 = 161.05
5. 11.19 + 0.88 = 12.07

#### Subtraction:
1. 100.81 - 3.92 = 96.89
2. 99.23 - 19.09 = 80.14
3. 62.97 - 59.13 = 3.84
4. 65.42 - 64.39 = 1.03
5. 9.91 - 7.37 = 2.54
6. 69.39 - 60.11 = 9.28

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