Counting - URBrainy.com - Free Printable

Problem Description:

The task is to fill in the missing numbers on a number track, which appears to be a circular sequence of numbers. The given numbers are:

- Top row: 10, 11, 12
- Middle-left: 8, 7, 5, 4, 3
- Middle-right: 14, 15, 16, 17
- Bottom-right: 20, 19

There are several gaps that need to be filled in.

---

Solution Approach:

1. Identify the Pattern:
- The numbers appear to be arranged in a circular sequence starting from 0 and increasing by 1.
- The sequence should include all numbers from 0 to 20.

2. Fill in the Gaps:
- Start with the known numbers and fill in the missing ones based on the sequence.

3. Step-by-Step Filling:
- Top Row: The numbers are 10, 11, 12. The next number after 12 should be 13.
- Middle-Left: The numbers are 8, 7, 5, 4, 3. The missing numbers between 8 and 7 are 6, and between 5 and 4 are no gaps.
- Middle-Right: The numbers are 14, 15, 16, 17. The previous number before 14 should be 13.
- Bottom-Right: The numbers are 20, 19. The previous number before 19 should be 18.
- Center: The center has 0 and 1. The missing number between them is 2.

4. Complete Sequence:
- Starting from 0 and moving clockwise, the complete sequence should be:
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20.

---

Filled Number Track:

Here is the completed number track with all gaps filled:

```
10 11 12 13 14
| | |
8 7 0 1 15
| | |
6 5 4 3 2 16
| |
17 18 19 20
```

---

Final Answer:

The missing numbers are:
- Top row: 13
- Middle-left: 6
- Middle-right: 13
- Bottom-right: 18
- Center: 2

Thus, the completed number track is:

\boxed{6, 13, 13, 18, 2}