Grade 1 - Addition to 40 (With and without Regrouping) worksheet ... - Free Printable

Let's solve each addition problem step by step and fill in the Tens and Ones columns correctly. The goal is to add two numbers, both less than 40, and practice place value (tens and ones).

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🔹 Problem 1:

15 + 21 = ?

Break it down:
- 15 = 1 ten + 5 ones
- 21 = 2 tens + 1 one

Add:
- Tens: 1 + 2 = 3 tens
- Ones: 5 + 1 = 6 ones

So, 15 + 21 = 36

```
Tens Ones
1 5
+ 2 1
---------
3 6
```

✔ Answer: 36

---

🔹 Problem 2:

24 + 14 = ?

- 24 = 2 tens + 4 ones
- 14 = 1 ten + 4 ones

Add:
- Tens: 2 + 1 = 3 tens
- Ones: 4 + 4 = 8 ones

So, 24 + 14 = 38

```
Tens Ones
2 4
+ 1 4
---------
3 8
```

✔ Answer: 38

---

🔹 Problem 3:

13 + 24 = ?

- 13 = 1 ten + 3 ones
- 24 = 2 tens + 4 ones

Add:
- Tens: 1 + 2 = 3 tens
- Ones: 3 + 4 = 7 ones

So, 13 + 24 = 37

```
Tens Ones
1 3
+ 2 4
---------
3 7
```

✔ Answer: 37

---

🔹 Problem 4:

26 + 11 = ?

- 26 = 2 tens + 6 ones
- 11 = 1 ten + 1 one

Add:
- Tens: 2 + 1 = 3 tens
- Ones: 6 + 1 = 7 ones

So, 26 + 11 = 37

```
Tens Ones
2 6
+ 1 1
---------
3 7
```

✔ Answer: 37

---

🔹 Problem 5:

16 + 13 = ?

- 16 = 1 ten + 6 ones
- 13 = 1 ten + 3 ones

Add:
- Tens: 1 + 1 = 2 tens
- Ones: 6 + 3 = 9 ones

So, 16 + 13 = 29

```
Tens Ones
1 6
+ 1 3
---------
2 9
```

✔ Answer: 29

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🔹 Problem 6:

27 + 12 = ?

- 27 = 2 tens + 7 ones
- 12 = 1 ten + 2 ones

Add:
- Tens: 2 + 1 = 3 tens
- Ones: 7 + 2 = 9 ones

So, 27 + 12 = 39

```
Tens Ones
2 7
+ 1 2
---------
3 9
```

✔ Answer: 39

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✔ Final Answers:

| Problem | Answer |
|--------|--------|
| 15 + 21 | 36 |
| 24 + 14 | 38 |
| 13 + 24 | 37 |
| 26 + 11 | 37 |
| 16 + 13 | 29 |
| 27 + 12 | 39 |

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📝 Explanation:

This worksheet helps students understand place value by breaking numbers into tens and ones, then adding each column separately. It reinforces mental math and written addition skills within 40.

All answers are less than 40, so no regrouping (carrying) is needed in these problems — perfect for Grade 1!

Let me know if you'd like this formatted as a filled-in PDF or printable version!