Skip Count by 12 worksheet for practicing number sequences up to 100.

Problem Description:

The task is to fill in the missing numbers in a 10x10 grid by skip-counting by 12. The grid already has some numbers filled in, and the goal is to complete it by following the pattern of adding 12 to each subsequent number.

Solution Approach:

1. Understand Skip Counting by 12:
- Skip counting by 12 means starting with a number and adding 12 repeatedly to get the next numbers in the sequence.
- For example, if we start at 1, the sequence would be: 1, 13, 25, 37, 49, ...

2. Identify the Pattern:
- The grid already has some numbers filled in. We need to use these as reference points to determine the missing numbers.
- Each row and column should follow the pattern of adding 12.

3. Fill in the Missing Numbers:
- Start from the given numbers and add 12 to find the next number in the sequence.
- Ensure that the numbers fit into the grid's structure (1 to 100).

Step-by-Step Solution:

#### Row 1:
- The first row starts with 1. Adding 12 repeatedly:
- 1, 13, 25, 37, 49, 61, 73, 85, 97
- Fill in the missing numbers:
- Row 1: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10

#### Row 2:
- The second row starts with 11. Adding 12 repeatedly:
- 11, 23, 35, 47, 59, 71, 83, 95
- Fill in the missing numbers:
- Row 2: 11, 12, 13, 14, 15, 16, 17, 18, 19, 20

#### Row 3:
- The third row starts with 21. Adding 12 repeatedly:
- 21, 33, 45, 57, 69, 81, 93
- Fill in the missing numbers:
- Row 3: 21, 22, 23, 24, 25, 26, 27, 28, 29, 30

#### Row 4:
- The fourth row starts with 31. Adding 12 repeatedly:
- 31, 43, 55, 67, 79, 91
- Fill in the missing numbers:
- Row 4: 31, 32, 33, 34, 35, 36, 37, 38, 39, 40

#### Row 5:
- The fifth row starts with 41. Adding 12 repeatedly:
- 41, 53, 65, 77, 89
- Fill in the missing numbers:
- Row 5: 41, 42, 43, 44, 45, 46, 47, 48, 49, 50

#### Row 6:
- The sixth row starts with 51. Adding 12 repeatedly:
- 51, 63, 75, 87, 99
- Fill in the missing numbers:
- Row 6: 51, 52, 53, 54, 55, 56, 57, 58, 59, 60

#### Row 7:
- The seventh row starts with 61. Adding 12 repeatedly:
- 61, 73, 85, 97
- Fill in the missing numbers:
- Row 7: 61, 62, 63, 64, 65, 66, 67, 68, 69, 70

#### Row 8:
- The eighth row starts with 71. Adding 12 repeatedly:
- 71, 83, 95
- Fill in the missing numbers:
- Row 8: 71, 72, 73, 74, 75, 76, 77, 78, 79, 80

#### Row 9:
- The ninth row starts with 81. Adding 12 repeatedly:
- 81, 93
- Fill in the missing numbers:
- Row 9: 81, 82, 83, 84, 85, 86, 87, 88, 89, 90

#### Row 10:
- The tenth row starts with 91. Adding 12 repeatedly:
- 91, 103 (but since the grid only goes up to 100, we stop at 91)
- Fill in the missing numbers:
- Row 10: 91, 92, 93, 94, 95, 96, 97, 98, 99, 100

Final Grid:

```
1 2 3 4 5 6 7 8 9 10
11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30
31 32 33 34 35 36 37 38 39 40
41 42 43 44 45 46 47 48 49 50
51 52 53 54 55 56 57 58 59 60
61 62 63 64 65 66 67 68 69 70
71 72 73 74 75 76 77 78 79 80
81 82 83 84 85 86 87 88 89 90
91 92 93 94 95 96 97 98 99 100
```

Final Answer:

\boxed{
\begin{array}{cccccccccc}
1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9 & 10 \\
11 & 12 & 13 & 14 & 15 & 16 & 17 & 18 & 19 & 20 \\
21 & 22 & 23 & 24 & 25 & 26 & 27 & 28 & 29 & 30 \\
31 & 32 & 33 & 34 & 35 & 36 & 37 & 38 & 39 & 40 \\
41 & 42 & 43 & 44 & 45 & 46 & 47 & 48 & 49 & 50 \\
51 & 52 & 53 & 54 & 55 & 56 & 57 & 58 & 59 & 60 \\
61 & 62 & 63 & 64 & 65 & 66 & 67 & 68 & 69 & 70 \\
71 & 72 & 73 & 74 & 75 & 76 & 77 & 78 & 79 & 80 \\
81 & 82 & 83 & 84 & 85 & 86 & 87 & 88 & 89 & 90 \\
91 & 92 & 93 & 94 & 95 & 96 & 97 & 98 & 99 & 100 \\
\end{array}
}