This free printable worksheet challenges students to arrange sets of three words into the correct alphabetical order.

Problem Overview:

The task requires arranging the given words in each group in alphabetical order based on their first letter. The solution involves identifying the correct order for each set of words and assigning numbers (1, 2, 3) to indicate their positions.

Solution:

#### Group 1:
- Words: potato, corn, spinach
- Alphabetical Order:
1. corn
2. potato
3. spinach

#### Group 2:
- Words: city, gas, kid
- Alphabetical Order:
1. city
2. gas
3. kid

#### Group 3:
- Words: pond, river, lake
- Alphabetical Order:
1. lake
2. pond
3. river

#### Group 4:
- Words: ship, wait, ice
- Alphabetical Order:
1. ice
2. ship
3. wait

#### Group 5:
- Words: red, blue, yellow
- Alphabetical Order:
1. blue
2. red
3. yellow

#### Group 6:
- Words: truck, bus, airplane
- Alphabetical Order:
1. airplane
2. bus
3. truck

#### Group 7:
- Words: lemon, berry, grape
- Alphabetical Order:
1. berry
2. grape
3. lemon

#### Group 8:
- Words: arm, man, talk
- Alphabetical Order:
1. arm
2. man
3. talk

#### Group 9:
- Words: pencil, book, ruler
- Alphabetical Order:
1. book
2. pencil
3. ruler

#### Group 10:
- Words: shirt, frock, jacket
- Alphabetical Order:
1. frock
2. jacket
3. shirt

#### Group 11:
- Words: jump, yard, fly
- Alphabetical Order:
1. fly
2. jump
3. yard

#### Group 12:
- Words: wind, ear, seed
- Alphabetical Order:
1. ear
2. seed
3. wind

Final Answer:

\[
\boxed{
\begin{array}{ccc}
\text{Group 1:} & \text{corn (1), potato (2), spinach (3)} \\
\text{Group 2:} & \text{city (1), gas (2), kid (3)} \\
\text{Group 3:} & \text{lake (1), pond (2), river (3)} \\
\text{Group 4:} & \text{ice (1), ship (2), wait (3)} \\
\text{Group 5:} & \text{blue (1), red (2), yellow (3)} \\
\text{Group 6:} & \text{airplane (1), bus (2), truck (3)} \\
\text{Group 7:} & \text{berry (1), grape (2), lemon (3)} \\
\text{Group 8:} & \text{arm (1), man (2), talk (3)} \\
\text{Group 9:} & \text{book (1), pencil (2), ruler (3)} \\
\text{Group 10:} & \text{frock (1), jacket (2), shirt (3)} \\
\text{Group 11:} & \text{fly (1), jump (2), yard (3)} \\
\text{Group 12:} & \text{ear (1), seed (2), wind (3)} \\
\end{array}
}
\]