Adding Decimals Using Grids Worksheets - Free Printable

Let’s solve each problem step by step. We’re adding decimals, so we line up the decimal points and add column by column from right to left — just like regular addition, but we keep the decimal point in the same place in the answer.

---

Problem 1:
```
40.6
+ 163.8
-------
```
Start from the tenths: 6 + 8 = 14 → write down 4, carry over 1
Ones: 0 + 3 + 1 (carry) = 4
Tens: 4 + 6 = 10 → write down 0, carry over 1
Hundreds: 1 + 1 (carry) = 2
→ 204.4

---

Problem 2:
```
112.9
+ 670.3
-------
```
Tenths: 9 + 3 = 12 → write 2, carry 1
Ones: 2 + 0 + 1 = 3
Tens: 1 + 7 = 8
Hundreds: 1 + 6 = 7
→ 783.2

---

Problem 3:
```
204.4
+ 378.1
-------
```
Tenths: 4 + 1 = 5
Ones: 4 + 8 = 12 → write 2, carry 1
Tens: 0 + 7 + 1 = 8
Hundreds: 2 + 3 = 5
→ 582.5

---

Problem 4:
```
7.2
+ 709.5
-------
```
Align decimals:
```
007.2
+ 709.5
-------
```
Tenths: 2 + 5 = 7
Ones: 7 + 9 = 16 → write 6, carry 1
Tens: 0 + 0 + 1 = 1
Hundreds: 0 + 7 = 7
→ 716.7

---

Problem 5:
```
0.7
+ 85.2
------
```
Align:
```
00.7
+ 85.2
------
```
Tenths: 7 + 2 = 9
Ones: 0 + 5 = 5
Tens: 0 + 8 = 8
→ 85.9

---

Problem 6:
```
69.1
+ 23.8
------
```
Tenths: 1 + 8 = 9
Ones: 9 + 3 = 12 → write 2, carry 1
Tens: 6 + 2 + 1 = 9
→ 92.9

---

Problem 7:
```
943.5
+ 60.9
------
```
Tenths: 5 + 9 = 14 → write 4, carry 1
Ones: 3 + 0 + 1 = 4
Tens: 4 + 6 = 10 → write 0, carry 1
Hundreds: 9 + 0 + 1 = 10 → write 0, carry 1
Thousands: 1
→ 1004.4

---

Problem 8:
```
452.6
+ 1.3
------
```
Tenths: 6 + 3 = 9
Ones: 2 + 1 = 3
Tens: 5 + 0 = 5
Hundreds: 4 + 0 = 4
→ 453.9

---

Problem 9:
```
5.3
+ 2.6
-----
```
Tenths: 3 + 6 = 9
Ones: 5 + 2 = 7
→ 7.9

---

Problem 10:
```
37.8
+496.2
------
```
Align:
```
037.8
+ 496.2
-------
```
Tenths: 8 + 2 = 10 → write 0, carry 1
Ones: 7 + 6 + 1 = 14 → write 4, carry 1
Tens: 3 + 9 + 1 = 13 → write 3, carry 1
Hundreds: 0 + 4 + 1 = 5
→ 534.0 or just 534

---

Final Answer:
1) 204.4
2) 783.2
3) 582.5
4) 716.7
5) 85.9
6) 92.9
7) 1004.4
8) 453.9
9) 7.9
10) 534