"Before and After Numbers worksheet with watering cans for children to practice number sequencing."

Problem Description:

The task is to write the numbers that come before and after the given numbers on the watering cans. The numbers on the watering cans are provided, and we need to fill in the blanks accordingly.

Solution Approach:

1. Identify the given number on each watering can.
2. Determine the number that comes before the given number. This is simply the given number minus 1.
3. Determine the number that comes after the given number. This is simply the given number plus 1.
4. Fill in the blanks with the calculated numbers.

Step-by-Step Solution:

#### First Row:
- Watering Can: 13
- Before: \(13 - 1 = 12\)
- After: \(13 + 1 = 14\)
- Fill in: \(12 \quad 13 \quad 14\)

- Watering Can: 10
- Before: \(10 - 1 = 9\)
- After: \(10 + 1 = 11\)
- Fill in: \(9 \quad 10 \quad 11\)

#### Second Row:
- Watering Can: 16
- Before: \(16 - 1 = 15\)
- After: \(16 + 1 = 17\)
- Fill in: \(15 \quad 16 \quad 17\)

- Watering Can: 14
- Before: \(14 - 1 = 13\)
- After: \(14 + 1 = 15\)
- Fill in: \(13 \quad 14 \quad 15\)

#### Third Row:
- Watering Can: 11
- Before: \(11 - 1 = 10\)
- After: \(11 + 1 = 12\)
- Fill in: \(10 \quad 11 \quad 12\)

- Watering Can: 19
- Before: \(19 - 1 = 18\)
- After: \(19 + 1 = 20\)
- Fill in: \(18 \quad 19 \quad 20\)

#### Fourth Row:
- Watering Can: 15
- Before: \(15 - 1 = 14\)
- After: \(15 + 1 = 16\)
- Fill in: \(14 \quad 15 \quad 16\)

- Watering Can: 12
- Before: \(12 - 1 = 11\)
- After: \(12 + 1 = 13\)
- Fill in: \(11 \quad 12 \quad 13\)

#### Fifth Row:
- Watering Can: 17
- Before: \(17 - 1 = 16\)
- After: \(17 + 1 = 18\)
- Fill in: \(16 \quad 17 \quad 18\)

- Watering Can: 20
- Before: \(20 - 1 = 19\)
- After: \(20 + 1 = 21\)
- Fill in: \(19 \quad 20 \quad 21\)

#### Sixth Row:
- Watering Can: 9
- Before: \(9 - 1 = 8\)
- After: \(9 + 1 = 10\)
- Fill in: \(8 \quad 9 \quad 10\)

- Watering Can: 18
- Before: \(18 - 1 = 17\)
- After: \(18 + 1 = 19\)
- Fill in: \(17 \quad 18 \quad 19\)

Final Answer:

\[
\boxed{
\begin{array}{ccc}
12 & 13 & 14 \\
9 & 10 & 11 \\
15 & 16 & 17 \\
13 & 14 & 15 \\
10 & 11 & 12 \\
18 & 19 & 20 \\
14 & 15 & 16 \\
11 & 12 & 13 \\
16 & 17 & 18 \\
19 & 20 & 21 \\
8 & 9 & 10 \\
17 & 18 & 19 \\
\end{array}
}
\]