Addition Tables worksheet focusing on adding tens to three-digit numbers, with various exercises and a confidence rating section.

Absolutely! Let’s solve this worksheet step by step. The task is “Adding tens to a 3-digit number” using addition tables. Each table has:

- A row of numbers (usually 2 or 3) at the top (addends)
- A column of numbers on the left (also addends)
- You need to fill in each cell by adding the number from the top row to the number from the left column.

We’ll go table by table and fill in all the blanks.

---

🔹 Table 1: Top row = 900, 100; Left column = 20, 50

| + | 900 | 100 |
|-----|------|------|
| 20 | 920 | 120 |
| 50 | 950 | 150 |

✔ Explanation:
- 20 + 900 = 920
- 20 + 100 = 120
- 50 + 900 = 950
- 50 + 100 = 150

---

🔹 Table 2: Top row = 70, 40; Left column = 300, 500

| + | 70 | 40 |
|-----|------|------|
| 300 | 370 | 340 |
| 500 | 570 | 540 |

✔ Explanation:
- 300 + 70 = 370
- 300 + 40 = 340
- 500 + 70 = 570
- 500 + 40 = 540

---

🔹 Table 3: Top row = 200, 600; Left column = 10, 30

| + | 200 | 600 |
|-----|------|------|
| 10 | 210 | 610 |
| 30 | 230 | 630 |

✔ Explanation:
- 10 + 200 = 210
- 10 + 600 = 610
- 30 + 200 = 230
- 30 + 600 = 630

---

🔹 Table 4: Top row = 60, 10; Left column = 420, 930

| + | 60 | 10 |
|-----|------|------|
| 420 | 480 | 430 |
| 930 | 990 | 940 |

✔ Explanation:
- 420 + 60 = 480
- 420 + 10 = 430
- 930 + 60 = 990
- 930 + 10 = 940

---

🔹 Table 5: Top row = 580, 250; Left column = 30, 80

| + | 580 | 250 |
|-----|------|------|
| 30 | 610 | 280 |
| 80 | 660 | 330 |

✔ Explanation:
- 30 + 580 = 610
- 30 + 250 = 280
- 80 + 580 = 660
- 80 + 250 = 330

---

🔹 Table 6: Top row = 40, 10; Left column = 660, 190

| + | 40 | 10 |
|-----|------|------|
| 660 | 700 | 670 |
| 190 | 230 | 200 |

✔ Explanation:
- 660 + 40 = 700
- 660 + 10 = 670
- 190 + 40 = 230
- 190 + 10 = 200

---

🔹 Table 7: Top row = 226, 961; Left column = 30, 20

| + | 226 | 961 |
|-----|------|------|
| 30 | 256 | 991 |
| 20 | 246 | 981 |

✔ Explanation:
- 30 + 226 = 256
- 30 + 961 = 991
- 20 + 226 = 246
- 20 + 961 = 981

---

🔹 Table 8: Top row = 90, 80; Left column = 528, 617

| + | 90 | 80 |
|-----|------|------|
| 528 | 618 | 608 |
| 617 | 707 | 697 |

✔ Explanation:
- 528 + 90 = 618
- 528 + 80 = 608
- 617 + 90 = 707
- 617 + 80 = 697

---

🔹 Table 9: Top row = 133, 455; Left column = 70, 60

| + | 133 | 455 |
|-----|------|------|
| 70 | 203 | 525 |
| 60 | 193 | 515 |

✔ Explanation:
- 70 + 133 = 203
- 70 + 455 = 525
- 60 + 133 = 193
- 60 + 455 = 515

---

## ✔ Final Answer (All Tables Completed):

Here are all the completed tables for easy copying:

---

Table 1
```
+ | 900 | 100
----|------|------
20 | 920 | 120
50 | 950 | 150
```

Table 2
```
+ | 70 | 40
----|------|------
300 | 370 | 340
500 | 570 | 540
```

Table 3
```
+ | 200 | 600
----|------|------
10 | 210 | 610
30 | 230 | 630
```

Table 4
```
+ | 60 | 10
----|------|------
420 | 480 | 430
930 | 990 | 940
```

Table 5
```
+ | 580 | 250
----|------|------
30 | 610 | 280
80 | 660 | 330
```

Table 6
```
+ | 40 | 10
----|------|------
660 | 700 | 670
190 | 230 | 200
```

Table 7
```
+ | 226 | 961
----|------|------
30 | 256 | 991
20 | 246 | 981
```

Table 8
```
+ | 90 | 80
----|------|------
528 | 618 | 608
617 | 707 | 697
```

Table 9
```
+ | 133 | 455
----|------|------
70 | 203 | 525
60 | 193 | 515
```

---

## 🧠 Key Concept:

This exercise reinforces place value understanding — when you add a multiple of 10 (like 20, 30, etc.) to a 3-digit number, only the tens digit (or sometimes hundreds if there's a carry-over) changes. For example:

- 420 + 60 → 480 → tens digit goes from 2 to 8.
- 528 + 90 → 618 → tens digit changes from 2 to 1, but hundreds increases by 1 due to carry-over.

This builds fluency in mental math and prepares students for more complex addition.

---

## ✍️ Score & Confidence:

Since all problems are solved correctly, you can confidently write:

> Your Score: 18/18
> 😊 Very confident

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Let me know if you’d like a printable version or want to check your own answers against this!